JPH06195917A - Floating magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] Levitating on the surface of a magnetic recording medium to increase the recording density and improve reliability when performing magnetic recording. [Structure] Located on the outer peripheral side on the magnetic recording medium in the floating magnetic head [External 5] As a result, the magnetic head slider 2 on the magnetic recording medium is
In the movement of, the increase in the flying height of the magnetic gap portion 6 on the outer peripheral side is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head which floats on the surface of a magnetic recording medium and performs magnetic recording / reproduction.

[0002]

2. Description of the Related Art FIGS. 8A and 8B are views showing the structure of a conventional floating type magnetic head. FIG. 8A is a front view, FIG. 8B is a side view thereof, and FIG.
Is a plan view. In this conventional example, a composite type magnetic head will be described as an example.

In FIG. 8, 1 is an electromagnetic conversion element,
The magnetic recording medium (not shown) has a magnetic gap 6 for recording / reproducing. The magnetic conversion element 1 is embedded in the slit 7 of the magnetic head slider 2 and fused by the mold glass 8.

[0004]

[Outer 1]

As a conventional example other than FIG. 8, there is also a thin film magnetic head in which the electromagnetic conversion element 1 is formed by a thin film technique.

Next, the operation of the floating magnetic head shown in FIG. 8 on the magnetic recording medium in the fixed magnetic disk device will be described with reference to FIG. As shown in FIG. 9, the magnetic head slider 2 balances the lift force due to the air pressure,
The magnetic head slider 2 is joined to a suspension 9 that applies a load, and is joined to a drive arm 10. These rotate about the axis 10a of the drive arm 10 and move from the inner peripheral side a to the outer peripheral side b of the magnetic recording medium 11 as shown by the solid line position and the broken line position. The flying characteristics of such a magnetic head slider 2 will be described.

On the magnetic recording medium 11 shown in FIG.
And the peripheral speed of the magnetic recording medium on the outer peripheral side b is different.
FIG. 4 is a characteristic diagram showing the relationship between the flying speed of the magnetic head slider and its peripheral speed. As is clear from FIG. 10, the flying height (vertical axis) increases in proportion to the peripheral speed (horizontal axis). However, the magnetic head slider 2 on the outer peripheral side b shown in FIG. 9 is not parallel to the normal direction 11a of the magnetic recording medium 11 but is inclined by the rotation angle of the drive arm 10 (hereinafter referred to as the skew angle θ). Will be located in.

That is, the magnetic head slider 2 at the position a on the inner circumference side in FIG. 9 is located in the normal direction 11a of the magnetic recording medium 11 as shown in FIG.
The magnetic head slider 2 at the outer peripheral side b position of FIG.
As shown in (b), the magnetic recording medium 11 has a skew angle θ with respect to the normal direction 11a.

FIG. 12 shows the flying height ratio at a constant peripheral speed (vertical axis).
It is a levitation characteristic diagram showing the relationship between the skew angle θ and the skew angle θ (horizontal axis), and it can be seen that the levitation amount decreases as the skew angle θ increases.

There is a roll amount in the method of defining the flying posture, and FIG. 13 is a flying state diagram showing the rolled state of the magnetic head slider. As shown in FIG. 13, this is an amount representing the levelness of the magnetic head slider 2 with respect to the magnetic recording medium 11 in the lateral width direction, and in FIG. 14, the roll amount at a constant peripheral speed.
The relationship between (vertical axis) and skew angle θ (horizontal axis) is shown. The roll amount is a value obtained by subtracting the flying height X ′ of the other air sliding surface 4 ′ corresponding to the position from the flying height X of the magnetic gap 6 of the air sliding surface 4 having the electromagnetic conversion element 1 shown in FIG. Is the roll amount XX ′.

It can be seen from FIG. 14 that the roll amount sharply increases when the skew angle θ is 10 ° or more.
That is, when the skew angle θ is added, the magnetic gap 6
The air-sliding surface 4 having the above surface will fly higher than the other air-sliding surface 4 '.

FIG. 15 shows a summary of the above contents of the magnetic head slider 2 in the mounted state of the fixed magnetic disk device in which the flying height (vertical axis) and the peripheral speed and the skew angle θ shown on the horizontal axis are the simultaneous parameters. The change in the flying height on the magnetic gap 6 is shown. As it moves from the inner peripheral side a to the outer peripheral side b, that is, the flying height tends to increase as the peripheral speed increases, but the outer peripheral side b
The tendency of the increasing curve is smaller in. This is a tendency that the increase of the flying height due to the increase of the peripheral speed and the phenomenon of the flying height due to the increase of the skew angle θ caused by the movement to the outer peripheral side b occur together.

[0013]

In the conventional floating magnetic head described above, as the magnetic recording medium 11 moves from the inner peripheral side a to the outer peripheral side b, the flying height increases and the space loss increases. Further, in the conventional recording method, since the recording wavelength on the outer peripheral side b is longer and the peripheral speed is faster than the inner peripheral side a, the outer peripheral side b
The playback output of was tending to be higher. However, in recent years, in order to improve the recording density, a zone bit recording method has been adopted in which the recording wavelengths on the inner peripheral side a and the outer peripheral side b are substantially the same. In this zone bit recording method, the recording wavelength on the outer peripheral side b becomes shorter than that in the conventional recording method, and therefore the increase in the flying height decreases the reproduction output, which is a major issue for realizing future high-density recording. .

In view of the above points, the present invention improves the recording density by suppressing an increase in the flying height of the magnetic gap portion on the outer peripheral side when the slider of the magnetic head moves on the magnetic recording medium. The purpose is to plan.

[0015]

In order to solve the above problem, the present invention solves the above-mentioned problems by forming a taper surface of an air inflow end of a sliding surface of an air in a floating magnetic head which is composed of two rails. Among them, the length of the air inflow end taper surface on the side having the electromagnetic conversion element located on the outer peripheral surface of the magnetic recording medium has an inclination angle which is longer than the length of the air inflow end taper surface on the inner peripheral side. It is a thing.

[0016]

According to the present invention, the magnetic head slider is caused to roll on the inner peripheral side of the magnetic recording medium, that is, in the vicinity of the skew angle of 0 °, and the air sliding surface on the inner peripheral side is floated high so that the outer peripheral side, Roll generation due to an increase in skew angle can be eliminated, and the increase in levitation due to the roll effect of the electromagnetic conversion element portion on the outer peripheral side is eliminated. Therefore, it is possible to obtain a substantially constant flying height of the electromagnetic conversion element section on the inner and outer circumferences, and prevent deterioration of the recording / reproducing capability on the outer circumference side.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as in the past are given the same numbers. FIG. 1 is a perspective view showing the overall structure of a magnetic head slider according to an embodiment of the present invention. In this embodiment, a composite type magnetic head will be described as an example. As shown in FIG. 1, the electromagnetic conversion element 1 made of a ferrite magnetic material formed by glass bonding has a magnetic gap 6. The magnetic head slider 2 has two air sliding surfaces 4, 4 '.
Among them, the electromagnetic conversion element 1 is inserted into the slit 7 of the air sliding surface 4 located on the outer peripheral side when the magnetic head slider 2 is installed on the surface of the magnetic recording medium 11 (see FIG. 3), and the mold glass 8 Are fused together.

[0018]

[Outside 2]

Next, FIG. 2 shows a front view (a), a side view (b) and a plan view (c) of the magnetic head slider of FIG.

The flying characteristics of the magnetic head slider 2 according to the present invention constructed as above will be described. FIG. 3 is a view for explaining the mechanism by which the magnetic head slider 2 flies over the magnetic recording medium 11. The magnetic head slider 2 is attached to the slider central portion 12 by a suspension 9 (see FIG. 9). The lift force F of the magnetic head slider 2 on the magnetic recording medium 11 rotating at a constant peripheral speed is
Air inflow when reaching the air outflow end (TE: trading edge) from (LE: leading edge) The maximum lift is exerted on the taper surface edge 13 of the air inflow end taper surface 3, 3'and the air sliding surface 4, 4 '. Of the magnetic head slider 2, the moment M flying about the slider central portion 12 becomes M
= RF (r; distance from the slider central portion 12 to the taper surface edge 13), and the surface of the air sliding surface 4, 4'with respect to the longitudinal direction of the magnetic head slider 2 flies as the pitch angle.

Length dimension and pitch angle of taper surface at air inflow end
As shown in Fig. 4, the relationship between (flying height) is 100
It is shown that the pitch angle works with the maximum μm dimension, and the pitch angle (flying height) decreases as the length of the tapered surface increases.

[0022]

[Outside 3]

From the flying characteristics of the magnetic head slider 2 constructed as described above, FIG. 6 shows the relationship between the roll amount and the skew angle under a constant peripheral speed. In FIG. 6, (a) shows the present invention, (a) shows the conventional roll amount change, and the roll amount changes from the floating amount of the magnetic gap 6 of the air sliding surface 4 having the electromagnetic conversion element 1 to the magnetic gap 6 A value obtained by subtracting the floating amount of the other air sliding surface 4'corresponding to the position is represented as the roll amount. In the roll amount (a) of the magnetic head slider according to the embodiment of the present invention, a negative roll amount (vertical axis) occurs at a skew angle of 0 ° (horizontal axis), and even if the skew angle increases, The minus roll amount hardly changes, but in the past, the plus roll amount increases as the skew angle increases.

Further, FIG. 7 shows the flying height (a) on the magnetic gap of the magnetic head slider according to the embodiment of the present invention when the peripheral speed and the skew angle are used as parameters at the same time, that is, when the fixed magnetic disk device is mounted. Shows the change of. Also in this figure, the flying characteristic (a) of the conventional magnetic head slider is also added for comparison. As shown in FIG. 7, the flying height of the conventional magnetic head slider tends to increase as the magnetic head slider moves from the inner circumference side to the outer circumference side on the magnetic recording medium. In the magnetic head slider according to the example, no significant increase in the flying height can be seen.

[0025]

As described above, in the floating magnetic head slider according to the present invention, the length of the air inflow end taper surface on the side having the electromagnetic conversion element located on the outer peripheral side of the magnetic recording medium is the inner peripheral side. By adopting a structure with an inclination angle that is longer than the length of the taper surface of the air inflow end, it is possible to suppress an increase in the flying height of the magnetic gap portion on the outer peripheral side when the magnetic head slider moves on the magnetic recording medium. Therefore, it is possible to easily provide an excellent floating magnetic head that can be applied to improve the recording density.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a magnetic head slider according to an embodiment of the present invention.

2 is a front view (a), a side view (b) and a plan view (c) of the magnetic head slider of FIG. 1. FIG.

FIG. 3 is a diagram for explaining a mechanism of the magnetic head slider of FIG. 1 flying above a magnetic recording medium.

FIG. 4 is a diagram showing a relationship between a length dimension of an air inflow end tapered surface and a pitch angle (flying height).

FIG. 5 is a diagram illustrating a flying state according to the length of a taper surface on the air inflow end of the magnetic head slider.

FIG. 6 is a characteristic diagram showing a relationship between a roll amount and a skew angle under a constant peripheral speed according to the present embodiment.

FIG. 7 is a characteristic diagram showing changes in the flying height over the magnetic gap of the magnetic head slider according to the present embodiment.

FIG. 8 is a diagram showing a structure of a conventional floating magnetic head.

9 is a diagram for explaining the operation of the magnetic head slider of FIG. 8 on a magnetic recording medium in the fixed magnetic disk device.

FIG. 10 is a characteristic diagram showing the relationship between the flying speed of the magnetic head slider and the peripheral speed.

FIG. 11 is a diagram illustrating a skew angle of the magnetic head slider in FIG. 9 with respect to a normal direction on a magnetic recording medium.

FIG. 12 is a levitation characteristic diagram showing the relationship between the ratio of the flying height and the skew angle under a constant peripheral speed.

FIG. 13 is a flying state diagram showing a rolled state of the magnetic head slider.

FIG. 14 is a characteristic diagram showing a relationship between a roll amount and a skew angle of a magnetic head slider under a constant peripheral speed.

FIG. 15 is a characteristic diagram showing the relationship between the flying speed of the magnetic head slider and the peripheral speed and the skew angle with reference to the radius of the magnetic disk.

[Explanation of symbols]

[Outside 4] 5 ... Air escape groove, 6 ... Magnetic gap, 7 ... Slit, 8 ... Mold glass, 9 ... Suspension,
10 ... Drive arm, 11 ... Magnetic recording medium, 12 ... Slider central part, 13 ... Tapered surface edge.

Claims (1)

[Claims] 1. An electromagnetic conversion located on an outer peripheral surface of a magnetic recording medium of a taper surface of an air inflow end of an air sliding surface composed of two rails in a floating magnetic head floating above the surface of a magnetic recording medium. A floating magnetic head, wherein the length of the air inflow end tapered surface on the side having the element has an inclination angle which is longer than the length of the air inflow end tapered surface on the inner peripheral side.