JP2002237031A - Magnetic transfer device and method of manufacturing magnetic recording medium - Google Patents

Abstract

[PROBLEMS] To provide a highly reliable magnetic transfer apparatus and a method for manufacturing a magnetic recording medium, which do not cause signal degradation at a position where an external magnetic field is removed. SOLUTION: A magnetic field is generated by a magnetic field generating means 3 on an adhered body in which a master information carrier 2 having a ferromagnetic material corresponding to an information signal formed on a surface of a base and a magnetic recording medium 1 having a ferromagnetic layer are adhered. To transfer the information signal of the master information carrier 2 to the magnetic recording medium 1 by applying
While relatively rotating the magnetic field generating means 3 and the contact body,
Driving means 1 for adjusting the distance between magnetic field generating means 3 and the close contact body
7 is provided. This allows the master information carrier 2
The application and removal of the external magnetic field in the transfer of the information signal to the magnetic recording medium 1 can be performed while rotating the magnetic field generating means 17 with respect to the close contact body.
Can be prevented from deteriorating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic transfer apparatus using a master information carrier for pre-recording a predetermined information signal on a magnetic recording medium used for a magnetic recording / reproducing apparatus having a large capacity and a high recording density, and The present invention relates to a method for manufacturing a magnetic recording medium.

[0002]

2. Description of the Related Art At present, a magnetic recording / reproducing apparatus has a tendency to have a high recording density in order to realize a small and large-capacity magnetic recording / reproducing apparatus. In the field of hard disk drives, which are typical magnetic disk devices, the areal recording density is already 10 Gb.
A device exceeding it / sqin has been commercialized, and one year later, a steep technological progress has been recognized such that a device having an areal recording density of 20 Gbit / sqin is expected to be practically used.

[0003] The technical background that has enabled such a high recording density is a magnetoresistive element type capable of reproducing a signal having a track width of only several μm with good SN characteristics while improving the linear recording density. It largely depends on the head.

Also, with the increase in recording density, a reduction in the flying height of the floating magnetic slider with respect to the magnetic recording medium has been required, and the possibility of disk / slider contact occurring for some reason during flying has increased. I have. Under such circumstances, the recording medium is required to have higher smoothness.

In order for the head to accurately scan a narrow track, the tracking servo technique of the head plays an important role. In a current hard disk drive using such a tracking servo technique, a tracking servo signal, an address information signal, a reproduction clock signal, and the like are recorded on a magnetic recording medium at fixed angular intervals. The drive device detects and corrects the position of the head based on these signals reproduced from the head at regular time intervals, thereby enabling the head to accurately scan the track.

Here, as described above, since the servo signal, the address information signal, the reproduction clock signal, and the like are used as reference signals for the head to accurately scan on the track, the writing (hereinafter referred to as formatting) is performed. To be described) requires high positioning accuracy. In a current hard disk drive, formatting is performed by positioning a recording head using a dedicated servo device (hereinafter, referred to as a servo writer) incorporating a high-accuracy position detection device utilizing optical interference.

[0007]

However, the following problems exist in the formatting by the servo writer.

First, recording by a magnetic head is basically linear recording based on the relative movement between a magnetic head and a magnetic recording medium, and it is necessary to write signals over a large number of tracks. In addition, preformat recording requires a great deal of time, and a plurality of expensive dedicated servo writers are required to increase productivity, so that preformat recording is expensive.

Second, the introduction and maintenance of many servo writers requires a large amount of cost. These problems become more serious as the track density increases and the number of tracks increases. Therefore, instead of using a servo writer for formatting, a master disk on which all servo information has been written in advance and a magnetic disk to be formatted are superimposed, and an external magnetic field for transfer is applied from the outside to magnetically transfer the master information. A method of batch transfer to a disk has been proposed.

[0010] As an example, Japanese Patent Application Laid-Open No. 10-45544
The magnetic transfer method disclosed in Japanese Unexamined Patent Publication (Kokai) No. H10-26095 is known. In the publication, a magnetic portion made of a ferromagnetic material is formed on the surface of the base in a pattern shape corresponding to the information signal to form a master information carrier, that is, a master for magnetic transfer, and the surface of this master information carrier is By contacting the surface of a sheet-shaped or disk-shaped magnetic recording medium on which a ferromagnetic thin film or a ferromagnetic powder coating layer is formed and applying a predetermined external magnetic field,
A method is disclosed in which a magnetization pattern having a pattern shape corresponding to an information signal formed on a master information carrier is recorded on a magnetic recording medium.

FIG. 32 shows an example of a process of initial magnetization and transfer of a magnetic recording medium conventionally performed in such a magnetic transfer system. FIG. 33 shows the relationship between the rotation phase of the magnetic head for generating an external magnetic field, the distance between the magnetic head gap and the surface of the magnetic recording medium, and the rotation speed of the magnetic head. When the magnetic head approaches or separates from the magnetic recording medium,
The magnetic head is driven only in the approach and separation directions without being driven to rotate. On the other hand, at the time of initial magnetization and transfer, the magnetic head rotates about a substantially central portion of the magnetic recording medium in order to apply a magnetic field to the magnetic recording medium. Therefore, in the conventional method, the approaching and separating operations of the magnetic head and the rotating operation for initial magnetization and transfer are performed completely independently.

Such a magnetic transfer method is a method in which an array pattern corresponding to an information signal provided on a master information carrier is collectively recorded as a magnetization pattern on a magnetic recording medium. It is important that the density information signal be recorded.

In the conventional magnetic transfer system as described above, the magnetic head for transfer is kept stationary relative to the magnetic recording medium with respect to the closely adhered body of the master information carrier and the magnetic recording medium, and then separated. Therefore, there is a problem that the recording signal is degraded (a large change in the reproduction peak level) occurs in a portion corresponding to the transfer magnetic head (450 ° phase position in FIG. 33).

FIG. 34 shows the peak value of the reproduction signal voltage with respect to the rotation phase of the magnetic recording medium. The abscissa in the figure indicates the vicinity of the magnetic head separation phase, and the numerical values are omitted. This is the same for FIG. 21 described below. FIG. 35 shows a reproduced signal waveform in a separation phase of the transfer magnetic head. The horizontal axis and the vertical axis indicate time and the reproduction signal voltage, respectively. In FIG. 34, as shown by the arrow, a portion where the peak value of the reproduced signal is low can be seen. FIG. 35 shows the reproduced signal waveform of this portion. As can be seen from FIG. 35, the voltage v2 is much lower than the voltage v1, indicating that the reproduced signal is degraded. Therefore, in that part, the signal-to-noise ratio (S / N) decreases and the error rate increases.

As described above, in the conventional system, the reproduction signal voltage is reduced in the phase in which the transfer magnetic head is separated.
Although the magnetic transfer recording is performed by an external magnetic field component horizontal to the master information carrier, an external magnetic field component perpendicular to the master information carrier is actually applied due to the structure of the magnetic head. The degradation of the recording signal as described above occurs because
This is because the influence of the vertical component is not canceled in the separation phase of the transfer magnetic head.

The deterioration of the recording signal in the transfer magnetic head separation phase tends to increase as the intensity of the applied external magnetic field increases. On the other hand, the coercive force of the magnetic recording medium tends to increase as the recording density increases in the future, so that the strength of the external magnetic field to be applied naturally needs to be increased. Therefore, it is considered that the degree of the deterioration of the recording signal described above will be further increased in the future, and the solution of this problem will be indispensable in the future.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a highly reliable magnetic transfer apparatus and a method of manufacturing a magnetic recording medium that do not cause signal deterioration at a position where an external magnetic field is removed. The purpose is to provide.

[0018]

In order to achieve the above object, a magnetic transfer apparatus according to the present invention comprises a master information carrier having a ferromagnetic material corresponding to an information signal formed on a surface of a base, and a ferromagnetic layer. A magnetic recording medium that has
In a magnetic transfer device for applying a magnetic field by a magnetic field generating means to transfer an information signal of the master information carrier to the magnetic recording medium, the magnetic field generating means may be rotated while the magnetic field generating means and the contact body are relatively rotated. A driving means for adjusting a distance between the contact body and the contact body.

According to the magnetic transfer apparatus as described above, the application and removal of the external magnetic field in the transfer of the information signal of the master information carrier to the magnetic recording medium is performed while rotating the magnetic field generating means with respect to the close contact member. Therefore, it is possible to prevent the reproduction signal of the magnetic recording medium from deteriorating.

In the magnetic transfer apparatus, the setting of the driving means is such that the driving means is moved to a position where the magnetic field generating means and the surface of the close contact body are close to each other, and about a substantially central portion of the magnetic recording medium as a center of rotation. After rotating at least one of the magnetic field generating means and the close contact body, rotating the magnetic field generating means relative to the close contact body, after rotating the relative rotation at least one turn, Preferably, the setting is such that the magnetic field generating means is separated from the close contact body while the rotation drive is continued. According to the magnetic transfer apparatus as described above, the transfer recording signal can be prevented from deteriorating in the separation phase of the magnetic head, and uniform transfer recording can be performed on the entire surface of the magnetic recording medium.

Further, the movement to the position where the magnetic field generating means and the surface of the close-contact body are close to each other is performed by rotating at least one of the magnetic field generating means and the close-contact body around a substantially central portion of the magnetic recording medium as a center of rotation. Preferably, the rotation is performed while rotating the magnetic field generating means relative to the close contact body. According to the magnetic transfer apparatus as described above, even when the magnetic head is approaching, deterioration of the transfer recording signal can be prevented, so that uniform transfer recording over the entire surface of the magnetic recording medium becomes more reliable.

Further, the driving means may be configured such that the magnetic field generating means and the surface of the close-contact body are close to each other, and the driving means is configured to rotate around a substantially central portion of the magnetic recording medium as a rotation center. At least one is driven to rotate,
The magnetic field generating means can be relatively rotated with respect to the close contact body, and the magnetic field generating means has a magnetic core and a coil, and a magnetic field is generated by energizing the coil by a current applying means. The setting of the current applying means is as follows:
It is preferable that after the relative rotation is made at least one time, the current value to be supplied to the coil is gradually reduced in a state where the rotational driving is continued. According to the magnetic transfer apparatus as described above, when the external magnetic field is removed by the magnetic head, deterioration of the transfer recording signal can be prevented, and uniform transfer recording over the entire magnetic recording medium becomes possible.

It is preferable that the current applying means applies a current value of the coil for generating a magnetic field required for the transfer while gradually increasing the current value while performing the rotation driving. According to the magnetic transfer device as described above,
Even at the start of application of external magnetization by the magnetic head,
Since the deterioration of the transfer recording signal can be prevented, uniform transfer recording over the entire surface of the magnetic recording medium can be more reliably performed.

Preferably, the magnetic field generating means has a magnetic core made of a ferromagnetic material and a permanent magnet.

Preferably, the magnetic field generating means has a magnetic core and a coil of a ferromagnetic material. According to the magnetic transfer apparatus as described above, the application and removal of the external magnetic field can be performed by controlling the current supplied to the coil.

Next, in the method of manufacturing a magnetic recording medium according to the present invention, a master information carrier having a ferromagnetic material corresponding to an information signal formed on a surface of a base is brought into close contact with a magnetic recording medium having a ferromagnetic layer. A method for manufacturing a magnetic recording medium for transferring an information signal of the master information carrier to the magnetic recording medium by applying a magnetic field by a magnetic field generating means to the contact body, wherein the magnetic field generating means and the surface of the contact body are Is moved to a position close to, and at least one of the magnetic field generating means and the close contact body is rotationally driven to rotate the magnetic field generating means relatively to the close contact body, and the relative rotation is performed. After at least one rotation, the transfer is completed by separating the magnetic field generating means from the close contact body while continuing the rotation drive. According to the method for manufacturing a magnetic recording medium as described above, it is possible to prevent the deterioration of the transfer recording signal in the separation phase of the magnetic head, and it is possible to perform uniform transfer recording over the entire surface of the magnetic recording medium.

In the method for manufacturing a magnetic recording medium,
The movement to the position where the magnetic field generating means and the surface of the close contact body are close to each other is performed by rotating at least one of the magnetic field generating means and the close contact body around a substantially central portion of the magnetic recording medium as a center of rotation. It is preferable that the magnetic field generation is performed while rotating the magnetic field generating means relative to the close contact body. According to the method for manufacturing a magnetic recording medium as described above,
Even when the magnetic head is close, deterioration of the transfer recording signal can be prevented, so that uniform transfer recording over the entire surface of the magnetic recording medium can be more reliably performed.

Further, the magnetic field generating means has a magnetic core and a coil. When a current is applied to the coil, a magnetic field is generated, and after the relative rotation is made at least one rotation, the rotation driving is performed. It is preferable that the transfer is completed by gradually decreasing the value of the current supplied to the coil in a continuous state. According to the magnetic transfer apparatus as described above, when the external magnetic field is removed by the magnetic head, deterioration of the transfer recording signal can be prevented, and uniform transfer recording over the entire magnetic recording medium becomes possible.

It is preferable that a current value of the coil for generating a magnetic field necessary for the transfer be applied while the current value is gradually increased while performing the rotation driving. According to the magnetic transfer apparatus as described above, even when the application of external magnetization by the magnetic head is started, deterioration of the transfer recording signal can be prevented, so that uniform transfer recording over the entire magnetic recording medium can be performed more reliably. Become.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a magnetic transfer apparatus according to this embodiment. 1 is a magnetic disk as a magnetic recording medium, 2 is a magnetic transfer master as a master information carrier, 2d is a contact surface of the magnetic transfer master 2 with the magnetic disk 1, and a contact surface 2d is shown in FIG. As shown in the figure, a groove 2e radiating from the center of the magnetic transfer master 2 is provided. 3 is a magnetic head for transfer, 4 is a magnetic head arm, 5 is a rotation axis of the magnetic head,
Reference numeral 17 denotes a magnetic head driving mechanism, and reference numeral 18 denotes a control circuit.

Reference numeral 6 denotes a support for supporting the magnetic disk 1, and a ventilation hole 7 for flowing gas is provided at the center. 8 is a flow path for discharging and pumping gas between the magnetic transfer master 2 and the magnetic disk 1, 9 is a gas discharge port for discharging gas from the flow path 8, and 10 is connected to the gas discharge port. A suction pump 11 is an exhaust valve for controlling gas discharge. Reference numeral 12 denotes an air supply pump for pumping gas into the flow path 8, and reference numeral 13 denotes an air supply valve for controlling gas supply.

Here, 0.01 μm is supplied to the air supply pump 12.
m is provided so that foreign substances having a size of 0.01 μm or more are not fed into the passage 8 by pressure. First, the drive mechanism of the transfer magnetic head 3 will be described. The transfer magnetic head 3 is attached to a magnetic head driving mechanism 17 via a magnetic head arm 4 and a magnetic head rotating shaft 5.

The magnetic head drive mechanism 17 rotates the transfer magnetic head 3 with respect to the magnetic disk 1 by rotating and driving the transfer magnetic head 3 in parallel with the magnetic disk 1. (E.g., a linear stage) for retracting the transfer magnetic head 3 from above the magnetic disk 1 (not shown).

The magnetic head driving mechanism 17 includes a control circuit 18
And is driven and controlled freely by a command signal from the control circuit 18. The configuration of the magnetic head drive mechanism is not limited to the configuration described above, and may be any configuration as long as the same operation can be performed.

Next, the steps of suction / pressure feeding of the magnetic transfer master will be described in detail with reference to FIGS.
First, a separation process by pressure feeding will be described with reference to FIG. Magnetic head 3 and magnetic head arm 4 shown in FIG.
And the rotating shaft 5 is moved by the magnetic head driving mechanism 17 in accordance with a signal from the control circuit 18 by the magnetic transfer master 2.
After retracting from the upper part, the master transfer member 14 for magnetic transfer is used.
To the magnetic transfer master 2. Thereafter, the suction channel 15 provided in the magnetic transfer master transport member 14 is provided.
The magnetic transfer master is adsorbed by discharging gas from the magnetic transfer master.

Next, by operating the air supply pump 12 with the exhaust valve 11 closed and the air supply valve 13 opened,
The gas flows into the passage 8. Then, air is pumped upward into the ventilation hole 7 as shown by the arrow D in FIG. Thereby, the air sent to the ventilation hole 7 is sent to the groove 2e. The air fed to the groove 2e radially spreads from the center of the magnetic transfer master 2 to the outer periphery through the groove 2e.

Then, the air further passes through the gap between the magnetic transfer master 2 and the magnetic disk 1 from the groove 2e to the atmosphere. By this operation, the magnetic transfer master 2 that has been in close contact with the magnetic disk 1 is slightly separated.

FIG. 4 shows the relationship between the lapse of time at this time and the air pressure in a space (hereinafter, referred to as space A) sandwiched between the magnetic transfer master 2 and the magnetic disk 1. In FIG. The air pressure in the space A becomes 101.3 kpa from the passage of about 3 seconds.
A period during which the air pressure rises instantaneously and the pressure is maintained at about 130 kpa for about one second thereafter corresponds to a state in which the magnetic transfer master 2 and the magnetic disk 1 are separated from each other as described above.

Next, the process of contact by suction will be described with reference to FIG. Stop the air supply pump 12,
The air supply valve 13 is closed. Thereafter, the exhaust valve 11 is opened, and the suction pump 10 is operated. Then, as shown by the arrow E in FIG. 3, the gas in the ventilation hole 7 is discharged downward, so that the gas inside the groove 2e, that is, the gas in the space A is also discharged.

Since the groove 2e does not extend to the outermost periphery of the magnetic transfer master 2 as shown in FIG. 2, the magnetic transfer master 2 and the magnetic disk 1 are connected at the outermost donut-shaped portion. Is in close contact with the entire circumference, and the space A is in a sealed state. The pressure will be lower than atmospheric pressure.

Accordingly, the magnetic transfer master 2 is pressed against the magnetic disk 1 by the atmospheric pressure. FIG.
The section where the air pressure in the space A is about 30 kpa corresponds to the close contact state.

Next, the magnetic transfer master 2 will be described in detail. FIG. 9 schematically shows a plane of an example of the magnetic transfer master 2, and as shown in FIG. 9, one main surface of the magnetic transfer master 2, that is, the side in contact with the ferromagnetic thin film surface of the magnetic disk 1. The signal region 2a is formed in a substantially radial manner on the surface of. FIG. 2 and FIG. 9 are diagrams schematically shown. Actually, the signal region 2a in FIG.
Are configured on the contact surface.

FIG. 10 schematically shows an enlarged view of a portion A surrounded by a dotted line in FIG. As shown in FIG.
In a, a master information pattern is formed at a position corresponding to a digital information signal to be recorded on the magnetic disk 1, for example, preformat recording, by a magnetic portion made of a ferromagnetic thin film in a pattern shape corresponding to the information signal. .

In FIG. 10, a hatched portion is a magnetic portion composed of a ferromagnetic thin film. The master information pattern shown in FIG. 10 is obtained by sequentially arranging respective areas of a clock signal, a tracking servo signal, an address information signal, and the like in the track length direction. Note that the master information pattern shown in FIG. 10 is an example,
In accordance with the digital information signal recorded on the magnetic disk 1, the configuration and arrangement of the master information pattern are appropriately determined.

For example, when a reference signal is first recorded on a magnetic film of a hard disk as in a hard disk drive and preformat recording of a tracking servo signal or the like is performed based on the reference signal, a master information medium according to the present invention is used. Only the reference signal used for preformat recording is transferred and recorded on the magnetic film of the hard disk in advance using the hard disk, and the hard disk is built into the drive housing, and the preformat recording such as the servo signal for tracking is performed by the magnetic head of the hard disk drive. May be used.

FIG. 11 shows a partial cross section of the region shown in FIGS. As shown in FIG. 11, a master 2 for magnetic transfer includes one main surface of a disk-shaped base 2b made of a non-magnetic material such as a Si substrate, a glass substrate, or a plastic substrate.
That is, on the surface on the side where the surface of the magnetic disk 1 contacts,
The recess 2c is formed in a plurality of fine array patterns corresponding to information signals, and the ferromagnetic film 16 as a magnetic part is formed in the recess 2c of the base 2b.

Here, as the ferromagnetic thin film 16, many kinds of magnetic materials can be used regardless of a hard magnetic material, a semi-hard magnetic material, and a soft magnetic material, and a digital information signal is transferred to a magnetic recording medium. Anything that can be recorded can be used. For example, Fe, Co, an Fe—Co alloy, or the like can be used.

In order to generate a sufficient recording magnetic field irrespective of the type of the magnetic recording medium on which the master information is recorded, it is generally better to increase the saturation magnetic flux density of the magnetic material. In particular, for a magnetic disk having a high coercive force exceeding 2000 Oe or a flexible disk having a large magnetic layer thickness, if the saturation magnetic flux density is 0.8 Tesla or less, sufficient recording may not be performed.
Generally, a magnetic material having a saturation magnetic flux density of 0.8 Tesla or more, preferably 1.0 Tesla or more is used.
The thickness of the ferromagnetic thin film 16 depends on the bit length, the saturation magnetization of the magnetic recording medium, and the thickness of the magnetic layer. For example, the bit length is about 1 μm, and the saturation magnetization of the magnetic recording medium is about 500 emu / c.
c, In the case where the thickness of the magnetic layer of the magnetic recording medium is about 20 nm, it may be about 50 nm to 500 nm.

Here, in such a recording method, in order to obtain good recording signal quality, based on an arrangement pattern of a soft magnetic thin film or a semi-hard magnetic thin film as a ferromagnetic thin film provided on a magnetic transfer master. At the time of preformat recording, it is desirable to excite the magnet and uniformly magnetize it, and prior to signal recording using the magnetic transfer master 2, it is desirable to uniformly magnetize a magnetic recording medium such as a hard disk. desirable.

Next, the transfer magnetic head 3 will be described. FIG. 8 is a sectional view of the transfer magnetic head 3 in the circumferential direction of the magnetic disk 1 and shows the distribution of magnetic field lines of the generated magnetic field. In the figure, reference numerals 3a and 3b denote a pair of magnetic cores, which are made of a ferromagnetic material such as SS41.

A permanent magnet 3c is made of a material having a high residual magnetic flux density, such as a neodymium / iron / boron-based material.
3d is a gap, 3e is a magnetic field line of the generated magnetic field.
A portion of a region J surrounded by an ellipse with a dotted line in the drawing is a horizontal magnetic field component used for transfer. On the other hand, the areas K and L are vertical magnetic field components that cause signal degradation in the conventional example.

Next, a method of manufacturing the magnetic transfer master 2 will be described. That is, the master for magnetic transfer used in the recording method of the present invention forms a resist film on the surface of the Si substrate, and exposes the resist film by a lithography technique using a laser beam or an electron beam such as a photolithography method. After development and patterning, etching is performed by dry etching or the like to form fine irregularities corresponding to the information signal, and then a ferromagnetic thin film made of Co or the like is sputtered, vacuum deposited, ion plated, CVD A magnetic transfer master having a magnetic portion corresponding to an information signal in a form in which a ferromagnetic thin film is embedded in a concave portion can be obtained by a method, a plating method, or the like.

The method of forming the irregularities on the surface of the magnetic transfer master is not limited to the above-mentioned method. For example, a fine irregularities may be directly formed by using a laser, an electron beam or an ion beam. Alternatively, fine irregularities may be directly formed by machining.

Next, a procedure for transferring and recording an information signal corresponding to the pattern shape formed on the magnetic transfer master 2 to the magnetic disk 1 will be described in more detail. FIG.
Indicates a transfer step of the present embodiment. The description will be made sequentially according to the steps shown in the drawings.

First, initial magnetization of the magnetic disk 1 is performed.
The configurations of the magnetic head driving mechanism 17 and the control circuit 18 are the same as those of the transfer magnetic head 3. As shown in FIG. 6, in the present embodiment, the gap portion of the magnetic head 103 for initial magnetization (having the same configuration as the magnetic head for transfer to be described later and having the opposite polarity of the permanent magnet) is provided on the magnetic disk 1 with a gap of 0.1 mm. A state close to a distance of 3 mm (close to the magnetic head for initial magnetization).

Next, the magnetic head driving mechanism 17 is driven by the signal of the control circuit 18 in the direction of arrow A in FIG. By rotating the magnetic head 103 by 360 degrees or more, for example, 450 degrees, the magnetization direction of the magnetic disk 1 is previously set to one direction (initial magnetization) as shown by the arrow in FIG. At the end of the initial magnetization, the initial magnetization magnetic head 103 is separated from the magnetic disk 1 while maintaining the rotation (separation of the initial magnetization magnetic head).

Next, the magnetic transfer master 2 and the magnetic disk 1 are uniformly brought into close contact with each other in a state where the magnetic transfer master 2 is positioned and superposed on the magnetic disk 1 by the method described above. Further, the transfer magnetic head 3 is moved in the direction of arrow B in FIG. 1 by the magnetic head driving mechanism 17 so that the gap 3d of the transfer magnetic head 3 is moved to the magnetic disk 1.
Close to a distance of 1.5 mm (close to the magnetic head for transfer).

Thereafter, the transfer magnetic head 3 is moved in parallel with the magnetic disk 1 around the substantially central portion of the magnetic disk 1.
Is rotated at a speed of 60 revolutions / min by the magnetic head driving mechanism 17 in the direction of arrow A in FIG. By this operation, a magnetic field is applied in a direction opposite to the initial magnetization.

FIG. 14 shows the state of the magnetizing process. As shown in FIG. 14, the magnetic transfer master 2 is brought into close contact with the magnetic disk 1 while the magnetic transfer master 2 is in close contact with the magnetic disk 1.
An information signal can be recorded on the ferromagnetic layer 1c of the magnetic disk 1 by applying a magnetic field from outside to magnetize the magnetic portion 16. That is, by using the magnetic transfer master 2 formed by forming the magnetic portion 16 made of a ferromagnetic thin film in an array pattern shape corresponding to a predetermined information signal on the non-magnetic base 2b, the magnetization corresponding to the information signal is obtained. The pattern can be magnetically transferred and recorded on the magnetic disk 1 as a pattern. The arrow shown in FIG. 13 indicates the direction of the magnetic field of the magnetization pattern transferred and recorded on the magnetic disk 1 at this time (transfer).

Here, the operation at the time of transfer will be described in more detail. Rotation phase of transfer magnetic head 3 during transfer, rotation speed of transfer magnetic head 3 and transfer magnetic head 3
FIG. 7 shows the relationship between the gap 3d and the distance from the surface of the magnetic disk 1.

Here, the transfer is completed when the transfer magnetic head 3 rotates 360 degrees or more, but thereafter, the transfer magnetic head 3 keeps rotating at 60 rotations / minute. In the example of this figure, when the rotation phase of the transfer magnetic head 3 becomes 450 degrees, it moves in the direction of arrow C in FIG. 1 and the transfer magnetic head 3 starts to separate from the magnetic disk 1 and the rotation phase becomes At 540 degrees, the separation has been completed. Even during this separation operation, the rotation operation of the transfer magnetic head 3 is continued.

In this embodiment, the separation distance is 3 mm. Regarding the operation during initial magnetization,
The same is true except that the distance of the magnetic head from the magnetic disk 1 is different.

Thereafter, the transfer master 2 is separated by the above-described method. According to the present embodiment, the result of reproducing a signal recorded on the magnetic disk 1 using a floating magnetic head (mounted with a magnetoresistive element) and a spin stand device used in an actual magnetic disk device is shown in FIG. 21 and FIG.

FIG. 21 shows the rotational phase of the magnetic disk 1 and the peak value of the reproduction signal voltage. FIG.
7 shows a reproduction waveform in a separation phase of the middle transfer magnetic head 3. As can be seen from FIG. 22, in the reproduced waveform, the voltages v1 and v2 substantially coincide with each other.
No large peak level decrease as seen in FIG. In other words, it can be seen that the separation of the transfer magnetic head 3 can be prevented while maintaining the rotation operation, thereby preventing the deterioration of the reproduction signal. As a result, the variation in the amplitude of the reproduced waveform can be suppressed over the entire rotation phase. That is, according to the present embodiment, it can be said that uniform transfer recording can be realized over the entire surface of the magnetic recording medium.

A schematic diagram showing a state of magnetization remaining in the magnetic layer of the magnetic disk 1 in this state and a schematic diagram of a reproduction signal waveform when a ring head corresponding thereto is used are shown in FIG.
16 (a) and 16 (b) respectively. Here, the direction of the arrow indicates the direction of the magnetic field, and the length indicates the strength of the magnetic field. A ring head (not shown) converts the change in magnetic flux crossing the gap into a current. Therefore, FIG.
By scanning close to the magnetic disk 1 magnetized as shown in FIG. 16A, magnetic flux leakage from the magnetic disk 1 is detected, and a reproduced signal waveform as shown in FIG. 16B is obtained.

Here, the difference between the state of application of the external magnetic field when the magnetic head 3 is separated from the conventional example and this embodiment will be described, and the reason why the peak level of the reproduced signal waveform does not decrease in the embodiment of the present invention will be described. I do. In FIG. 15, the line segment FF indicates the approximate height of the contact surface between the transfer master 2 and the disk 1.

FIG. 18 shows the history of the magnetic field applied to the point G on the line segment FF when the magnetic head 3 moves rightward in the figure. The horizontal axis of FIG. 18 indicates a magnetic field intensity component horizontal to the transfer master 2, and the vertical axis indicates a magnetic field intensity component perpendicular to the transfer master 2.

The magnetic field strength in the horizontal direction is positive for a magnetic field going rightward in the figure, and the magnetic field strength in the vertical direction is positive for a magnetic field going upward in the figure. Here, the curve shown by the solid line is the history of the magnetic field at the point G when the magnetic head 3 passes during the transfer.

The history of the magnetic field at point G shown in FIG. 18 will be described in comparison with FIG. The point a in FIG. 18 corresponds to the case where the magnetic head 3 is located sufficiently away from the point G. As the point proceeds from the point a to the point b, the vertical magnetic field increases and reaches the maximum at the point b. As the position advances from the point b to the point c, the vertical magnetic field decreases and the horizontal magnetic field increases, and reaches a maximum at the point c. This corresponds to passing through the point G in the order of the vertical magnetic field L and the horizontal magnetic field J. That is, as the vertical magnetic field L approaches the point G, the vertical magnetic field at the point G increases, and from the point G, the vertical magnetic field L
, The horizontal magnetic field J increases as the horizontal magnetic field J approaches the point G.

Further, as going from the point c to the point d,
As the horizontal magnetic field decreases, the vertical magnetic field increases in the negative direction, and reaches a maximum at point d. When reaching the point a via the point d, both the vertical magnetic field and the horizontal magnetic field become zero.
This corresponds to passing the point G in the order of the horizontal magnetic field J and the vertical magnetic field K. At the point a where the magnetic head is sufficiently far from the point G, each magnetic field is zero. That is, as the horizontal magnetic field J moves away from the point G, the horizontal magnetic field at the point G decreases, and as the vertical magnetic field K approaches the point G, the vertical magnetic field at the point G increases.

The broken line in FIG. 18 is a comparative example showing the history of the magnetic field applied to the points H and I when the magnetic head 3 is separated in the vertical direction in FIG. When the magnetic head 3 is separated in the vertical direction, points H and I are positions where the recording signal level is particularly greatly reduced. Points b and d correspond to the magnetic fields at points I and H, respectively, when the magnetic head is at the start point position. As the magnetic head 3 moves away from the transfer master 2, the horizontal magnetic field has a maximum value, but this maximum value is smaller than the locus of the solid line. In the solid line, the vertical magnetic field is zero at the point where the horizontal magnetic field has the maximum value, but a considerable amount of the vertical magnetic field is applied in the locus of the broken line.

In the case where the magnetic head 3 passes in this way and the case where the magnetic head 3 is separated in the vertical direction, the transfer master 2
The history of the magnetic field applied to the magnetic head 3 is greatly different, and this difference is the cause of the deterioration of the recording signal caused only by the separation phase of the magnetic head 3.

A schematic diagram of the magnetization state of the magnetic layer of the magnetic disk 1 in the separation phase of the magnetic head 3 of the conventional magnetic disk 1 and a schematic diagram of a signal waveform reproduced by using a corresponding magnetic head mounted on an actual hard disk drive are shown in FIG. FIG.
(A) and FIG. 20 (b) respectively. As in FIG. 16, the direction of the arrow indicates the direction of the magnetic field, and the length indicates the strength of the magnetic field. As described above, when the magnetization intensity partially decreases, the reproduction signal voltage decreases correspondingly.

FIG. 19 shows the relative velocity between the magnetic head 3 and the transfer master 2 at the time of transfer, the separation operation of the magnetic head 3 in the conventional example, and the separation operation of the magnetic head 3 according to the embodiment of the present invention. As shown. S1 in the figure
Denotes a speed vector at the time of transfer, S2 denotes a velocity vector at the time of the separating operation of the magnetic head 3 in the conventional example, and S3 denotes a velocity vector at the time of the separating operation of the magnetic head 3 according to the embodiment of the present invention.

As described above, the relative speed between the magnetic head 3 and the transfer master 2 during the separation operation of the magnetic head 3 according to the embodiment of the present invention is such that the magnetic head 3 rotates even when the magnetic head 3 is separated. It becomes closer to the speed vector at the time of transfer as compared with the conventional example. Therefore, until the magnetic field applied from the magnetic head 3 to the transfer master becomes sufficiently small, a shape substantially similar to the history of the magnetic field strength indicated by the solid line in FIG. 18 is maintained. As a result, the demagnetization of the recording signal generated at the time of separation in the conventional example is greatly reduced.

As described above, according to the present embodiment, a great effect that good transfer can be realized over the entire surface of the magnetic disk 1 can be obtained by partially changing the transfer process as compared with the conventional method.

In this embodiment, the transfer magnetic head 3 is driven to rotate. However, the same effect can be obtained by driving the magnetic disk 1 to rotate. That is, the transfer magnetic head 3 only needs to rotate relatively to the magnetic disk 1 side, and both the transfer magnetic head 3 and the magnetic disk 1 side may be driven to rotate.

Further, in the present embodiment, the transfer magnetic head 3 has been described as having a configuration including a magnetic core and a permanent magnet. However, it is sufficient that an external magnetic field similar to that shown in FIG. 8 is generated. An electromagnet including a core and a coil may be used. Although detailed description is omitted here, the same operation is performed for the operation at the time of initial magnetization. Further, in the present embodiment, the case where the magnetic recording medium is an in-plane recording medium has been described as an example, but the same effect can be obtained when the present magnetic transfer apparatus is used for transfer to a perpendicular recording medium.

(Embodiment 2) Next, another embodiment of the present invention will be described. A description of the same contents as in the first embodiment will be omitted. The first embodiment aims at solving the deterioration of the signal at the separated position of the transfer magnetic head 3. However, even when the transfer magnetic head 3 approaches, the transfer conditions, for example, the transfer magnetic head 3. However, if the recording signal is not completely overwritten when passing through the proximity position again, signal deterioration may be observed even at the proximity position.

Therefore, in the first embodiment, the separation of the transfer magnetic head 3 is performed simultaneously with the rotation operation only when the transfer magnetic head 3 is separated. In this embodiment, however, FIG. In accordance with the illustrated steps, when the transfer magnetic head 3 performs the proximity operation, the proximity operation of the transfer magnetic head 3 is performed simultaneously with the rotation operation as in the separation operation.

FIG. 24 shows the relationship between the rotation phase of the transfer magnetic head 3 during transfer, the rotation speed of the transfer magnetic head 3, and the distance between the gap 3d of the transfer magnetic head 3 and the surface of the magnetic disk 1. I have. As shown in this figure, when the distance between the gap 3d of the transfer magnetic head 3 and the surface of the magnetic disk 1 is close to 3 mm to 1.5 mm, and when the distance is 1.5 mm to 3 mm. In both cases, the magnetic head is rotating at 60 revolutions / minute.

By adopting such a process, it is possible to record signals with higher reliability under a wide range of transfer conditions.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described in detail. A description of the same contents as in the first embodiment will be omitted. FIGS. 25 and 26 show a magnetic transfer device according to the present embodiment. FIG.
2 shows a circumferential cross-sectional view of the magnetic disk 1 of the magnetic head 203 according to the present embodiment and the distribution of the lines of magnetic force of the generated magnetic field.

In the figure, 203a and 203b are magnetic cores made of a pair of ferromagnetic materials, 203c is a coil, 203d is a gap, and 203e is a line of magnetic force. In the first and second embodiments, the application and removal of the external magnetic field are performed by moving the magnetic head close to and away from the magnetic head. On the other hand, in the present embodiment, the application and removal of the external magnetic field are performed by controlling the current flowing through the coil 203c.

A procedure for transferring and recording an information signal corresponding to the pattern shape formed on the magnetic transfer master 2 on a magnetic disk will be described with reference to FIGS. 25 to 27. First, with the magnetic disk 1 mounted on the support base 6 as shown in FIG.
Is brought close to the magnetic disk 1 to a distance of, for example, 0.3 mm (proximity to the magnetic head). In that state, the magnetic head 20
For example, a current of 20 A is supplied to the third coil 203c,
Generate a magnetic field.

Next, by rotating the rotating shaft 5 in the direction of arrow A in FIG. 26 about the center of the magnetic disk 1 substantially, the magnetic head 203 is rotated by 360 degrees or more, for example, 450 degrees. As shown by the arrow in FIG. 12, the magnetization direction of the magnetic disk 1 is set to one direction in advance (initial magnetization).

Next, while the rotation of the magnetic head 203 is maintained, the value of the current flowing through the coil 203c is gradually reduced. Thereafter, the magnetic head 203 is separated from the disk 1 by one end.

Next, as shown in FIG. 25, in a state where the magnetic transfer master 2 is positioned and superposed on the magnetic disk 1, the magnetic transfer master 2 and the magnetic disk 1 are uniformly brought into close contact with each other. In this state, the gap 203d of the magnetic head 203 is brought close to the magnetic disk 1 to a distance of, for example, 1.5 mm (proximity to the magnetic head). After that, the coil 203c is again put into the coil 203c in the opposite direction to the initial magnetization, for example, for 2 seconds.
A current of 0 A is applied, and the magnetic head 203 is moved in parallel with the magnetic disk 1 around the center of the magnetic disk 1 as shown in FIG.
By rotating in the direction of the middle arrow A, a magnetic field is applied in a direction opposite to the initial magnetization, and transfer is performed (transfer).

The operation at the time of transfer will now be described in more detail. FIG. 28 is a diagram showing the relationship between the magnetic head rotation phase at the time of transfer, the magnetic head rotation speed, and the current value applied to the coil of the magnetic head in the third embodiment.
The transfer is completed when the magnetic head 203 is rotated by 360 degrees or more, but the coil 20 is rotated at 450 degrees with the magnetic head 203 rotated.
The value of the current flowing through 3c is gradually reduced.

More specifically, the coil current is reduced from 20 A to 0 A when the rotation phase is from 450 degrees to 540 degrees. During this time, the magnetic head 203 continues to rotate at 60 revolutions / minute. In the present embodiment, the magnetic head 2
Since the current value is gradually reduced while rotating 03, the transfer is completed without separating the magnetic head 203.

The operation during the initial magnetization is the same except that the distance of the magnetic head from the magnetic disk 1 is different. By adopting such a process, the first embodiment
The same effect can be obtained. By using an electromagnet for the magnetic head in this way, the magnetic head for initial magnetization and the magnetic head for transfer can be used in common, and the magnetic field can be applied and removed by controlling the current, so that the degree of freedom in designing the device is improved. There is an advantage.

In the present embodiment, the case where the magnetic recording medium is an in-plane recording medium has been described as an example. However, similar effects can be obtained when the present magnetic transfer apparatus is used for transfer to a perpendicular recording medium. .

(Embodiment 4) Next, another embodiment of the present invention will be described. The description of the same contents as in the third embodiment is omitted. In the third embodiment, the purpose is to solve the deterioration of the signal at the position where the magnetic head 203 cuts off the coil 203c. However, even when the current is applied to the coil, the transfer condition, that is, the magnetic head 2
For example, when the overwriting is not complete when 03 passes through the current application position again, signal degradation may be observed even at the current application position. Therefore, in the third embodiment,
The purpose of this embodiment is to prevent the signal from deteriorating at the current interruption position by gradually decreasing the current of the coil 203c of the magnetic head 203. In the present embodiment, the current application is performed according to the process shown in FIG. At the same time, the rotation is performed at the same time as the current interruption. FIG. 31 shows the relationship between the rotation phase of the magnetic head 203 during transfer, the rotation speed of the magnetic head 203, and the current value applied to the coil 203e of the magnetic head 203.

As shown in the figure, when applying a current, the coil current is gradually increased from 0 A to 20 A while the magnetic head is rotating at 60 revolutions / minute. At the time of current interruption, the coil current is gradually reduced from 20 A to 0 A while the magnetic head continues to rotate at 60 revolutions / minute.
In the present embodiment, while rotating the magnetic head 203,
Since the application and interruption of the current value are performed, the position of the magnetic head 203 in the height direction is fixed from the start to the end of the transfer.

By adopting such a process, it is possible to record a signal with higher reliability under a wide range of transfer conditions. The same applies to the initial magnetization except that the position of the magnetic head with respect to the magnetic disk is different.

[0097]

As described above, according to the present invention, in the separation phase of the magnetic head, deterioration of the transfer recording signal due to the influence of the vertical magnetic flux existing below the gap of the magnetic head used for generating the external magnetic field is prevented. This enables uniform transfer recording over the entire surface of the magnetic recording medium.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a magnetic transfer device according to a first embodiment during transfer.

FIG. 2 is a diagram showing a contact surface 3 with a magnetic disk 1 in a magnetic transfer master 2 according to the first embodiment;

FIG. 3 is a sectional view showing a state where the master carrier of the magnetic transfer device according to the first embodiment is sucked / separated.

FIG. 4 is a diagram showing a relationship between time and air pressure in a space A according to the first embodiment;

FIG. 5 is a diagram showing a transfer process according to the first embodiment;

FIG. 6 is a diagram showing an initial magnetization method for the magnetic disk according to the first embodiment;

FIG. 7 is a diagram illustrating a relationship between a magnetic head rotation phase during transfer, a magnetic head rotation speed, and a distance between a magnetic head gap and a magnetic disk surface according to the first embodiment;

FIG. 8 is a sectional view of the magnetic head according to the first embodiment;

FIG. 9 is a diagram showing a signal area on a master information carrier according to the first embodiment.

FIG. 10 is a diagram illustrating an example of the configuration of the first embodiment shown in FIG.
Diagram showing the details of the section

FIG. 11 is a detailed sectional view of a signal area on a master information carrier according to the first embodiment;

FIG. 12 is a diagram showing an initial magnetization state of the magnetic disk according to the first embodiment;

FIG. 13 is a diagram showing a transfer magnetic field application direction to the magnetic disk according to the first embodiment;

FIG. 14 is a diagram showing a magnetization state of a master information carrier and a magnetic disk during transfer according to the first embodiment;

FIG. 15 is a sectional view of the magnetic head according to the first embodiment;

FIG. 16 is a schematic diagram of a cross section of a magnetic disk in a good recording state and a diagram showing a corresponding reproduction signal;

FIG. 17 is a sectional view of the magnetic head according to the first embodiment;

FIG. 18 is a diagram schematically illustrating a transfer magnetic field and a history of a magnetic field when the magnetic head is separated.

FIG. 19 is a magnetic head 3 and a transfer master 2;
Diagram showing the relative speed of

FIG. 20 is a schematic diagram of a cross section of a magnetic disk in which a part of a recording signal is demagnetized and a diagram showing a corresponding reproduction signal;

FIG. 21 is a diagram illustrating a relationship between a disk rotation phase and a peak value of a reproduction signal according to the first embodiment;

FIG. 22 is a diagram showing a reproduced signal waveform at a transfer magnetic head separation start position according to the first embodiment;

FIG. 23 is a diagram showing a transfer process according to the second embodiment;

FIG. 24 is a diagram illustrating a relationship between a magnetic head rotation phase at the time of transfer, a magnetic head rotation speed, and a distance between a magnetic head gap and a magnetic disk surface according to the second embodiment;

FIG. 25 is a sectional view of the magnetic transfer device according to the third embodiment at the time of transfer;

FIG. 26 is a sectional view of the magnetic transfer apparatus according to the third embodiment at the time of initial magnetization;

FIG. 27 is a diagram showing a transfer step according to the third embodiment;

FIG. 28 is a diagram showing a relationship between a magnetic head rotation phase during transfer, a magnetic head rotation speed, and a current value applied to a coil of the magnetic head according to the third embodiment.

FIG. 29 is a sectional view of a magnetic head according to the third embodiment;

FIG. 30 is a diagram showing a transfer process according to the fourth embodiment.

FIG. 31 is a diagram showing a relationship between a magnetic head rotation phase at the time of transfer, a magnetic head rotation speed, and a current applied to a coil of the magnetic head according to the fourth embodiment;

FIG. 32 is a diagram showing a transfer process in a conventional example.

FIG. 33 is a diagram showing a relationship between a magnetic head rotation phase during transfer, a magnetic head rotation speed, and a distance between a magnetic head gap and a magnetic disk surface in a conventional example.

FIG. 34 is a diagram showing a relationship between a disk rotation phase and a peak value of a reproduction signal in a conventional example.

FIG. 35 is a diagram showing a reproduction signal waveform at a transfer magnetic head separation start position in a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magnetic disk 2 master information carrier 3 transfer magnetic head 4 magnetic head arm 5 rotating shaft 6 support base 7 ventilation hole 8 flow path 9 gas discharge port 10 suction pump 11 exhaust valve 12 air supply pump 13 air supply valve 17 magnetic head drive Mechanism 18 Control circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taizo Hamada 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. 72) Inventor Yasuaki Ban 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (11)

[Claims] 1. A magnetic field is applied by a magnetic field generation means to a contact body in which a master information carrier having a ferromagnetic material corresponding to an information signal formed on a surface of a base and a magnetic recording medium having a ferromagnetic layer are brought into close contact with each other. A magnetic transfer device for transferring the information signal of the master information carrier onto the magnetic recording medium, wherein the distance between the magnetic field generating means and the close contact body is relatively increased while the magnetic field generating means and the close contact body are relatively rotated. A magnetic transfer device comprising a driving unit for adjusting the pressure. 2. The method according to claim 1, wherein the setting of the driving unit includes moving the magnetic field generating unit and a surface of the close contact body to a position where the magnetic field generating unit and the close contact body are close to each other. After rotating at least one of the close contact members to rotate the magnetic field generating means relative to the close contact member, and after rotating the relative rotation at least one turn, the rotational driving is continued. The magnetic transfer apparatus according to claim 1, wherein the magnetic field generating unit is set to be separated from the close contact body while the magnetic field generating unit is separated from the close contact body. 3. A movement of the magnetic field generating means to a position where the surface of the close contact body is close to the surface of the close contact body is performed by rotating at least one of the magnetic field generating means and the close contact body around a substantially central portion of the magnetic recording medium as a center of rotation. 3. The magnetic transfer apparatus according to claim 2, wherein the rotation is performed while rotating the magnetic field generating means relative to the contact body. 4. The driving means, wherein the magnetic field generating means and the surface of the close-contact body are close to each other, and about a substantially central portion of the magnetic recording medium as a center of rotation, the driving means includes: By rotating at least one, the magnetic field generating means can be relatively rotated with respect to the close contact body, wherein the magnetic field generating means has a magnetic core and a coil, and is provided by a current applying means. A magnetic field is generated by energizing the coil, and the setting of the current applying unit is such that after the relative rotation is performed at least one rotation, the rotation driving is continued.
The magnetic transfer apparatus according to claim 1, wherein the value of the current supplied to the coil is gradually reduced. 5. The method according to claim 4, wherein the current application unit applies a current value of the coil for generating a magnetic field required for the transfer while gradually increasing the current value while performing the rotation drive. Magnetic transfer device. 6. The magnetic transfer apparatus according to claim 1, wherein said magnetic field generating means has a magnetic core made of a ferromagnetic material and a permanent magnet. 7. The magnetic transfer apparatus according to claim 1, wherein said magnetic field generating means has a magnetic core and a coil of a ferromagnetic material. 8. A magnetic field is applied by a magnetic field generating means to a contact body in which a master information carrier having a ferromagnetic material corresponding to an information signal formed on a surface of a base and a magnetic recording medium having a ferromagnetic layer are brought into close contact with each other. And transferring the information signal of the master information carrier to the magnetic recording medium, wherein the magnetic field generating means is moved to a position where the surface of the close contact body comes close to the magnetic field generating means. And rotating at least one of the close-contact members to rotate the magnetic field generating means relative to the close-contact members, and after rotating the relative rotation at least once, continuing the rotation drive A method of manufacturing a magnetic recording medium, wherein the transfer is completed by separating the magnetic field generating means from the close contact body. 9. The movement of the magnetic field generating means to a position where the surface of the close contact body is close to the position of the magnetic recording medium is performed with at least one of the magnetic field generating means and the close contact body around a substantially central portion of the magnetic recording medium as a center of rotation. 9. The method for manufacturing a magnetic recording medium according to claim 8, wherein the driving is performed while rotating the magnetic field generating means relative to the contact body. 10. The magnetic field generating means has a magnetic core and a coil, and a magnetic field is generated by energizing the coil, and after the relative rotation is made at least one rotation,
9. The method of manufacturing a magnetic recording medium according to claim 8, wherein the transfer is completed by gradually decreasing a current value to be supplied to the coil in a state where the rotational driving is continued. 11. The method for manufacturing a magnetic recording medium according to claim 10, wherein a current value of the coil for generating a magnetic field necessary for the transfer is applied while gradually increasing the current value while performing the rotation drive. .