JPH09219006A - Magnetic head, two-channel magnetic head, and magnetic storage device using the same - Google Patents

Abstract

(57) Abstract: A bulk type magnetic head having a low magnetic head height and an efficient core is provided. A front core part (2) having a magnetic gap
And a back core portion 3, and the back core portion 3 is joined to one side surface of the front core portion 2 to form a closed magnetic circuit,
The magnetic head 1 is constructed by winding the winding 4 on the back core portion 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulk type magnetic head, a two-channel magnetic head, and a magnetic storage device using this magnetic head.

[0002]

2. Description of the Related Art In a magnetic storage device, a magnetic head having a structure in which a plurality of magnetic gaps are arranged in parallel has been proposed in order to increase the transfer rate of recorded information, and has been put to practical use for a video floppy, for example.

[0003]

However, the magnetic head having the structure in which a plurality of magnetic gaps are arranged in parallel is as follows.
In most cases, a thin film head is used in order to avoid problems such as structural interference with adjacent channels.

In order to simultaneously record and reproduce two channels in-line, as shown in FIG. 20, two magnetic heads 51, 51 are provided corresponding to a recording pattern P having a predetermined recording track width Tw and a track-to-track distance Td. It is necessary to arrange the magnetic gaps g ₁ and g ₂ formed between the magnetic cores 53 of 52 close to each other.

However, in a bulk magnetic head, 2
When the two magnetic heads 51 and 52 are brought close to each other, as shown in FIG. 21, the winding 5 of each magnetic head at the rear of the magnetic head
4,55 interference is a problem. When the magnetic heads 51 and 52 of FIG. 21 are applied to a so-called MIG (metal in gap) type magnetic head in which a metal magnetic film 57 is interposed between the magnetic gap portions g ₁ and g ₂ of a ferrite core 56. Is.

Therefore, a thin film head is used for the two-channel magnetic head. In the case of this thin film head, however, the one having a structure in which two gaps have different azimuths is difficult to manufacture, and is therefore practically used. It has not been realized.

On the other hand, in a data storage system such as a hard disk, it is required to increase the storage capacity of the device by accommodating a large number of magnetic recording media in a small volume. The problem is how to make the gap smaller.

In view of the above points, the present invention provides a bulk type magnetic head capable of avoiding the problem of structural interference with adjacent channels, and a bulk type magnetic head for two channels. .

Further, the present invention provides a magnetic storage device provided with such a magnetic head, in which the distance between stacked magnetic recording media can be reduced and the number of magnetic recording media accommodated per device can be increased. Is.

[0010]

According to the present invention, there is provided a magnetic head comprising:
A front core portion having a magnetic gap and a back core portion are formed. The back core portion is joined to one side surface of the front core portion to form a closed magnetic circuit, and the back core portion is wound. It is a thing.

The magnetic head of the present invention is a magnetic head for recording on two channels, and has a front core portion having a magnetic gap and a back core portion, and the back core portion is the front core portion. Two head elements, which are joined to one side surface to form a closed magnetic circuit and have windings on the back core portion, are arranged close to each other such that the back core portions are on opposite sides.

According to the above-described structure of the present invention, the back core portion having the front core portion and the back core portion having the magnetic gap and joined to one side surface of the front core portion is wound. As a result, the magnetic path length can be shortened to improve the efficiency of the head core, and the height of the magnetic head, that is, the length in the magnetic gap depth direction can be reduced.

Further, in a magnetic head for recording on two channels, it has a front core portion and a back core portion having a magnetic gap, and a winding is formed on a back core portion joined to one side surface of the front core portion. By preparing two head elements to be applied and arranging them in close proximity so that their back core portions are on opposite sides, the windings are arranged and formed on both outer sides on opposite sides, so that adjacent channels are formed. It is possible to avoid the interference of the winding with.

Further, the present invention constitutes a magnetic storage device having a plurality of these magnetic heads, and the plurality of magnetic heads and the plurality of magnetic recording media are alternately arranged in parallel with each other. According to this structure, since the height of the magnetic head is formed low, the number of magnetic recording media per unit volume can be increased.

A magnetic head of the present invention has a front core portion having a magnetic gap and a back core portion, and the back core portion is joined to one side surface of the front core portion to form a closed magnetic path. It is formed and the back core portion is wound.

The two-channel magnetic head of the present invention is a magnetic head for recording on two channels, and has a front core portion having a magnetic gap and a back core portion, and the back core portion is the front core portion. Two head elements, which are joined to one side surface to form a closed magnetic path and have windings on the back core portion, are arranged closely to each other such that the back core portions are on opposite sides.

According to the present invention, in the above-mentioned two-channel magnetic head, a shield member is provided between two head elements.

According to the present invention, in the above-mentioned two-channel magnetic head, the magnetic gap of the magnetic core has an azimuth angle.

According to the present invention, in the above magnetic head, a ferromagnetic metal thin film is formed in the vicinity of the magnetic gap of the magnetic core in parallel with the surface where the magnetic gap is formed.

According to the present invention, in the above-described two-channel magnetic head, a ferromagnetic metal thin film is formed in the vicinity of the magnetic gap of the magnetic core in parallel with the surface where the magnetic gap is formed.

The magnetic storage device of the present invention has a structure in which the magnetic head of the present invention is arranged between a plurality of laminated magnetic recording media.

The magnetic storage device of the present invention has a structure in which the two-channel magnetic head of the present invention is arranged between each of a plurality of laminated magnetic recording media.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a bulk type magnetic head of the present invention. The magnetic head 1 of this embodiment includes a front core portion 2 having a magnetic gap g and a rod-shaped back core portion 3, and the back core portion 3 is bonded to one side surface 2 a of the front core portion 2. Then, a closed magnetic circuit is formed by these, and the back core portion 3 is further provided with the winding 4. The front core portion 2 has a sliding surface S for sliding on the magnetic recording medium formed on the front surface thereof as a cylindrical curved surface, forms a magnetic path, and defines the gap depth length of the magnetic gap g. A magnetic path forming groove 5 having a slope is formed on the side of the magnetic gap g.

Then, a joint surface 2a of the front core portion 2 with the back core portion 3 outside the surface where the magnetic gap g is formed.
A track width regulation groove 6 for regulating the width Tw of the recording track on the magnetic recording medium is formed on the side.

Further, in this magnetic head 1, the shape near the magnetic gap g is not symmetrical about the track width Tw, and the edge position of the magnetic gap g is on the side opposite to the back core portion 3 side of the front core portion 2. It almost coincides with the end face 2b.

Although not shown in FIG. 1, in actuality, the entire track width regulating groove 6 and the portion of the magnetic path forming groove 5 on the magnetic gap g side are filled with fused glass, whereby The pair of magnetic core halves forming the front core portion 2 are fused.

In the conventional bulk type magnetic head, the magnetic path length becomes long because it is necessary to secure a space for winding the magnetic core. On the other hand, according to the magnetic head 1 of the present embodiment, the winding 4 is formed on the rod-shaped back core portion 3 separated from the front core portion 2, so that the magnetic head 1 is different from the conventional bulk type magnetic head. The magnetic path can be shortened, whereby the efficiency of the core can be improved and the magnetic head can be constructed.

Further, according to the magnetic head 1 of this embodiment,
Since the back core portion 3 is arranged at the rear end of the main surface of the front core portion 2, as shown in FIG. 1, the height of the magnetic head (the length of the magnetic gap in the depth direction) H _{1 is set} to the conventional bulk type. It can be made smaller than that of the magnetic head.

The magnetic head 1 of the above-mentioned embodiment can be manufactured, for example, as follows. First, as shown in FIG. 2, a core substrate 9 having a flat plate shape made of, for example, a single crystal Mn—Zn ferrite material is prepared, and a main surface 9a, which is a magnetic gap forming surface of the core substrate 9, is mirror-polished.

Next, as shown in FIG. 3, a track width restricting groove 6 having a substantially arcuate cross section for restricting one side of the track width is formed on the main surface 9a of the core substrate 9 which is a magnetic gap forming surface.
It is formed at a predetermined pitch interval. As a result, a magnetic gap forming portion 9b having a width Tw ₀ satisfying Tw <Tw ₀ with respect to the specified track width Tw is formed between the adjacent track width regulating grooves 6.

Next, as shown in FIG. 4, the track width regulating groove 6 is formed on the main surface 9a of the core substrate 9 which serves as the magnetic gap forming surface.
A magnetic path forming groove 5 for forming a magnetic path and a glass groove 7 for ensuring the bonding strength between the core substrates 9 are formed in a direction substantially orthogonal to the above. Magnetic path forming groove 5
Is. A substantially U-shaped cross section having a surface substantially parallel to the main surface 9a serving as a magnetic gap forming surface, and a surface perpendicular to the main surface 9a of the core substrate and inclined surfaces at both end edges of this surface. It is formed as a groove to be formed, and is formed in the direction orthogonal to the track width regulating groove 6 over the entire longitudinal direction of the core substrate 9. The inclined surface of the magnetic path forming groove 5 functions to regulate the gap depth length Dp in the magnetic gap as described above. In this way, the magnetic core half block 10 is formed.

Next, as shown in FIG. 5, this magnetic core half body block 10 and another magnetic core half body block 11 formed through the same steps as described above are aligned with the track edge positions. , Butt and stack.
That is, the edge positions of the magnetic gap g are aligned, and the magnetic gap forming portions 9b are butted so as to face each other. When the magnetic core half blocks 10 and 11 are butted against each other, although not shown, a gap spacer having a thickness corresponding to a preset gap length is interposed at the bonding interface except the magnetic gap forming surface.

And, these magnetic core half blocks 1
Glass rods (not shown) are inserted into the magnetic path forming grooves 5 respectively provided in 0 and 11, and then the glass rods are melted while the magnetic core half blocks 10 and 11 are pressed from both ends thereof. As a result, as shown in FIG. 6, the fused glass 8 is formed in a part of the magnetic path forming groove 5, whereby the pair of magnetic core half blocks 10 and 11 are joined and integrated, and the magnetic core block 12 is formed. Is formed. The fused glass 8 is also filled in the track width regulation grooves 6 facing each other, and plays a role of ensuring the contact property with respect to the magnetic recording medium.

Further, the magnetic core block 12 is cut at the portions shown by the dotted lines in FIG. 6 between the magnetic path forming grooves 5 to separate into the core blocks 13 for one row of magnetic cores.

Next, as shown in FIG. 7, a sliding surface S with respect to the magnetic recording medium is attached to the core block 13 separated from the magnetic core block 12 which is joined and integrated into one row of magnetic cores. and cylinder polished, track width of a portion which is set by the track width regulating grooves 6 from the core block 13 to Tw <Tw ₀ becomes length, so that a predetermined width Tw, drawing a-a ', The head chip 14 to be the front core portion 2 having the shape shown in FIG. 8 is cut out by cutting so as to leave a shaded portion at a position indicated by a line bb '.

The head chip 14 cut out at this time is further cut at a portion where the magnetic path forming groove 5 is parallel to the gap surface, that is, a portion indicated by a chain line in FIG. The core part 2 is formed. As a result, the magnetic path in the rear portion of the front core portion 2 of the magnetic head 1 is divided. At this time, the surface 2a to be joined after the front core portion 2 is mirror-finished until a desired surface roughness is obtained depending on the grinding state of the surface.

Next, a back pillar portion 3 having a quadrangular prism shape (rod shape) shown in FIG. 9A is prepared. Then, as shown in FIG. 10, the back core portion 3 is joined to the rear end of the one end surface 2 a of the front core portion 2 while being offset from the other front core portion 2. As a result, the previously divided magnetic path is formed as a closed magnetic path. The joining in this case can be performed with an adhesive or the like, for example.

Finally, the winding 4 made of copper wire or the like is wound around the joined back core portion 3 to form the target magnetic head 1 shown in FIG.

The above-described manufacturing process is an example of a method of manufacturing the magnetic head 1 of the above-described embodiment, and the magnetic head of the present invention can be manufactured by other methods.

For example, if the manufacturing method is simple, the winding 4 may be wound around the back core portion 3 in advance before the back core portion 3 is joined to the front core portion 2.

The winding 4 is previously formed on the back core portion 3.
If the space for winding is secured, the magnetic path forming groove 5 of the front core portion 2 does not need to be a space, and the magnetic path forming groove 5 is filled with glass or the like to increase the strength. May be. In this case, as shown in FIG. 12, for example, by forming the winding groove 15 for the winding in the back core portion 3, even if the fusion-bonding glass 8 is filled in the entire magnetic path forming groove 5, After that, the winding 4 can be wound around the back core portion 3.

The magnetic head of the present invention has a bulk type magnetic head currently used as a basic structure. In addition to the ferrite head whose magnetic core is composed of only ferrite, as shown in FIG. In the magnetic gap g, a ferromagnetic metal thin film 16 made of, for example, a soft magnetic alloy is formed in parallel with the surface on which the magnetic gap g is formed, and further covers the track width regulating groove 6 to form a MIG (metal in gap) type. A magnetic head can be used as the basic structure.

In the above-described embodiment, the shape of the front core portion 2 in the vicinity of the magnetic gap g is not symmetrical about the track width Tw, but it is different from other head elements such as a two-channel magnetic head described later. When used as a single magnetic head without being adjacent to each other, the shape in the vicinity of the magnetic gap g of the front core portion 2 is set to the track width Tw.
A symmetrical structure can be obtained with respect to.

In the magnetic head according to the present invention, basically, the manufacturing method of the conventional bulk type magnetic head can be applied by the same method up to the intermediate step, and the conventional magnetic head manufacturing technology can be applied.

On the other hand, in the two-channel magnetic head of the present invention, in order to avoid the above-mentioned problem of winding interference, the core shape of the rear portion of the magnetic head is devised without impairing the performance of the magnetic head.

An embodiment of the two-channel magnetic head of the present invention will be described with reference to the drawings. FIG. 14 shows a schematic perspective view of an embodiment of the two-channel magnetic head of the present invention. The two-channel magnetic head 21 has a front core portion 22 having magnetic gaps g _A and g _B , respectively.
And a back core portion 23, and the back core portion 23 is
Two heads that are joined to one side surface 22a of the front core portion 22 to form a closed magnetic path, and have a winding 24 provided on the back core portion 22, that is, two heads having the same structure as the magnetic head 1 of the above-described embodiment. The elements 25 and 26 are arranged close to each other with their back core portions 23 on opposite sides.

In each head element 25, 26, a sliding surface S for sliding on the magnetic recording medium is formed on the front surface of the front core portion 22 as a cylindrical curved surface, and the magnetic gaps g _A , g _B are formed. A magnetic path forming groove 27 having an inclined surface is formed on the sliding surface S side in order to define the gap depth length.

A track width restricting groove 28 for restricting the width Tw of the recording track on the magnetic recording medium is provided outside the surface where the magnetic gap g is formed, on the joint surface 22a side of the front core portion 22 with the back core portion 23. Is formed, and the fused glass 30 is filled in the track width regulating groove 28 and the portion of the magnetic path forming groove 27 on the sliding surface S side.

The upper parts of the respective head elements 25 and 26 constituting the two-channel magnetic head 21, that is, the parts on the sliding surface S side, have almost the same shape as the bulk type magnetic head currently used for VTRs or the like. have.

Back core portion 23 for winding 24
As shown in FIG. 14, is provided on the rear end of the front core portion 22 in a state of being offset from the other front core portions 22. By adopting the structure as shown in FIG. 14, it is possible to form a two-channel structure without the head elements 25 and 26 that are arranged in a concatenated manner interfere with each other.

Head elements 25, 26 arranged adjacent to each other
Is determined by the configuration of the magnetic recording system.

In the case of so-called guard band recording in which a non-recorded portion is provided between tracks, as shown in FIG. 15, in the case where both head elements 25 and 26 are closest to each other, the distance between these head elements 25 and 26 is , An interval between track patterns recorded on a magnetic tape 31 which is a magnetic recording medium, that is, an A track T _A recorded by a magnetic gap g _A of the head element 25 and a head element 26.
Is equal to the width Bw of the guard band 32 formed between the track _B and the B track T _B recorded by the magnetic gap g _B.

In the case of so-called azimuth recording in which no distance is set between tracks, as shown in FIG. 16, for example, two-channel magnetic heads 21a and 21b having the same structure are arranged at intervals of several tracks according to the track pitch P, for example. And a 2-channel magnetic head 21a for + azimuth,
-As a two-channel magnetic head 21b for azimuth,
It is also possible to arrange them adjacently. In the case of FIG. 16, the distance between the head elements 25a and 26a and 25b and 26b of the two-channel magnetic heads 21a and 21b is set to 2
P, that is, twice the track interval P. As a result, the recording pattern on the magnetic tape 31 becomes
The + azimuth recording pattern and the −azimuth recording pattern are alternately formed.

Further, in order to avoid crosstalk from adjacent head elements, in addition to the structure of the above-mentioned embodiment, a shield member is arranged and formed between the magnetic heads as needed. FIG. 17 shows a configuration example of the 2-channel magnetic head in this case. This 2 channel magnetic head 2
1, the shield member 33 is formed between the two head elements 25 and 26, so that crosstalk between the head elements 25 and 26 can be avoided.

Next, the electromagnetic conversion characteristics of the magnetic head of the present invention were examined. As an example, measurement was performed using the magnetic head 1 of the above-described example. As a comparative example, a conventional bulk type magnetic head manufactured without using the step of cutting the magnetic path in the rear portion shown in FIG. 8 was directly used as a magnetic head for measurement.

The design of dimensions and the like of each magnetic head was as follows. Example: track width 15 μm, gap depth 20 μm,
Number of windings 6 turns Comparative example: track width 15 μm, gap depth 20 μm,
Number of windings 14 turns

The measurement conditions of each sample were as follows. Tape speed: 3.13 m / s, Tape type: ME Recording magnetic head: MIG type magnetic head Using a head tester

As a result of the measurement, the reproduction output per turn of the magnetic head (6 turns) of the example was 7.5 μVpp /
The output per turn of the magnetic head (14 turns) of the comparative example having the same size was 7.8 μVpp / T.

From this, it was found that the magnetic head of this example had electromagnetic conversion characteristics equivalent to those of the conventional bulk type magnetic head.

That is, according to the magnetic head of the present invention, while having the electromagnetic conversion characteristics equivalent to those of the conventional bulk type magnetic head, the height of the magnetic head is reduced as described above, and the magnetic storage device or the like is provided. Can be miniaturized. Furthermore, it is presumed that the electromagnetic conversion characteristics can be further improved by adopting a structure in which the magnetic path of the magnetic head is shortened.

By making use of the structural characteristics of the magnetic head of the present invention and the two-channel magnetic head of the present invention described above, the height of the magnetic head is suppressed to a low level, so that the magnetic recording medium has a high height, such as a hard disk drive. In a disk-type magnetic storage device stacked in the direction, the gap between the magnetic recording media can be narrowed to increase the number of magnetic recording media accommodated per device and increase the storage capacity per unit volume. it can.

FIG. 18 shows an embodiment of a magnetic memory device to which the magnetic head of the present invention is applied. This magnetic storage device 40 is
A large number of disk-shaped magnetic recording media 41 are laminated with the same rotation axis at a predetermined interval D ₁ , and each magnetic recording medium 41 has the above-described magnetic head 1 of the embodiment of the present invention. Is attached to the arm 42. The magnetic head 1 can record information on each magnetic recording medium and reproduce the recorded information.

As described above, since the height of the magnetic head 1 is smaller than that of the conventional bulk type magnetic head, the distance D ₁ between the magnetic recording media can be shortened, and The number of magnetic recording media 41 per unit height of the storage device 40 can be increased as compared with the conventional case, whereby the storage capacity can be increased.

This magnetic storage device 40 is an example in which recording is performed on only one side of the magnetic recording medium 41. For example, as shown in FIG. 19, the magnetic head of the present invention is provided on both sides of the magnetic recording medium 41. It is also possible to adopt a configuration in which is arranged and recording is performed on both sides. In addition to the illustrated example, the structure of the magnetic head is such that the two-channel head of the present invention is applied to perform two-channel recording on a magnetic recording medium, or the structure of another magnetic head applicable to the magnetic head of the present invention. Etc. can also be taken.

The magnetic head of the present invention, the two-channel magnetic head, and the magnetic storage device using the same are not limited to the above-mentioned embodiments, and various other structures are possible without departing from the gist of the present invention. Can be taken.

[0065]

According to the magnetic head of the present invention, the magnetic path can be shortened and the efficiency of the core can be improved as compared with the conventional bulk type magnetic head.

Then, the manufacturing process of the conventional bulk type magnetic head can be utilized, and it is also possible to manufacture the MIG type magnetic head.

Further, according to the present invention, it is possible to manufacture an in-line type two-channel magnetic head, which has been difficult to manufacture by the conventional bulk type magnetic head, without deteriorating its magnetic characteristics. In addition, it is possible to easily manufacture an in-line two-channel head having azimuth, which is difficult to process with a thin-film in-line two-channel head.

According to the magnetic storage device in which a plurality of magnetic recording media are stacked according to the present invention, by applying the above magnetic head, the number of magnetic recording media per device can be increased and the storage capacity can be increased. it can.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment of a magnetic head of the present invention.

FIG. 2 is a process drawing of one manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 3 is a process drawing of one manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 4 is a process drawing of one manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 5 is a process drawing of a manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 6 is a process drawing of one manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 7 is a process drawing of one manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 8 is a process drawing of a manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 9 is a process drawing of a manufacturing process of the embodiment of the magnetic head of the present invention. It is a perspective view of an A back core part. FIG. 6 is a perspective view of a B front core portion.

FIG. 10 is a process drawing of a manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 11 is a process drawing of a manufacturing process of the embodiment of the magnetic head of the present invention.

FIG. 12 is a schematic perspective view of an application example in which a winding groove is formed in the back core portion of the embodiment of FIG.

FIG. 13 is a schematic perspective view of an application example in which a MIG type magnetic head is applied to the magnetic head of the present invention.

FIG. 14 is a schematic perspective view of an embodiment of a two-channel magnetic head of the present invention.

15 is an application example of guard band recording of the embodiment of FIG.

16 is an application example of azimuth recording of the embodiment of FIG.

FIG. 17 is a schematic perspective view of an application example in which a shield member is formed between the head elements of the embodiment of FIG.

FIG. 18 is a schematic configuration diagram of an example of a magnetic storage device to which the magnetic head of the invention is applied.

FIG. 19 is a schematic configuration diagram of an example of a magnetic storage device to which the magnetic head of the present invention is applied when recording is performed on both sides of a magnetic recording medium.

FIG. 20 is a diagram showing an arrangement configuration of a recording pattern and a magnetic head in 2-channel recording.

FIG. 21 is a schematic perspective view of a conventional bulk type magnetic head used as it is for a two-channel magnetic head.

[Explanation of symbols]

1 Magnetic head, 2,22 Front core part, 3,23
Back core part, 4,24 winding, 5,27 magnetic path forming groove, 6,28 track width regulating groove, 7 glass groove, 8,
30 fused glass, 9 core substrate, 9b magnetic gap forming part, 10, 11 magnetic core half block, 12 magnetic core block, 13 core block, 14 head chip, 15 winding groove, 16 ferromagnetic metal thin film, 21 2
Channel magnetic head, 21a + two-channel magnetic head for azimuth, 21b-two-channel magnetic head for azimuth, 25,26 head element, 31 magnetic tape, 32 guard band, 33 shield member, 40
Magnetic storage device, 41 magnetic recording medium, 42 arm, S
Sliding surface, g, g ₁ , g ₂ , g _A , g _B magnetic gap

Claims (8)

[Claims] 1. A front core portion having a magnetic gap and a back core portion, wherein the back core portion is joined to one side surface of the front core portion to form a closed magnetic path, and the back core portion is provided. A magnetic head characterized in that a winding is applied to the magnetic head. 2. A magnetic head for recording on two channels, comprising: a front core portion and a back core portion having a magnetic gap, wherein the back core portion is bonded to one side surface of the front core portion. 2 to form a closed magnetic circuit, and to form a closed magnetic circuit, and to form a closed magnetic circuit on the back core portion.
A two-channel magnetic head, wherein the back cores are arranged close to each other on opposite sides. 3. The two-channel magnetic head according to claim 2, further comprising a shield member between the two head elements. 4. The two-channel magnetic head according to claim 2, wherein the magnetic gap of the magnetic core has an azimuth angle. 5. A magnetic gap near the magnetic core,
2. The magnetic head according to claim 1, wherein a ferromagnetic metal thin film is formed in parallel with the surface where the magnetic gap is formed. 6. In the vicinity of the magnetic gap of the magnetic core,
The two-channel magnetic head according to claim 2, wherein a ferromagnetic metal thin film is formed in parallel with the surface where the magnetic gap is formed. 7. A magnetic storage device in which the magnetic head according to claim 1 is arranged between a plurality of stacked magnetic recording media. 8. A magnetic storage device comprising the two-channel magnetic head according to claim 2 disposed between a plurality of laminated magnetic recording media.