JPH04186573A - Magnetic head slider and magnetic disk apparatus using the same - Google Patents

Abstract

PURPOSE:To obtain an efficient slider by forming a flat surface inclined laterally of rails at least at parts of the rails provided at a magnetic head slider in such a manner that the inclined surface is directed rightward or leftward with respect to a center line along the rail. CONSTITUTION:Rails 2a, 2b are provided on a magnetic head slider 1, and composed of air bearing surfaces 3a, 3b inclined longitudinally of the rails, air bearing surfaces 4a, 4b inclined laterally of the rails, and flat surfaces 5a, 6a, 5b, 6b to become air bearing surfaces. Accordingly, a spacing can be microscopically reduced without increasing a pressing load and without reducing the width of the slider. Since a recording density can be enhanced and a contact area with the surface of a magnetic recording medium can be reduced, adherence can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head slider and a magnetic disk device using the same, and particularly to a magnetic head with narrow spacing, high recording density, and high reliability. The present invention relates to a slider and a magnetic disk device using the slider.

[Conventional technology]

A magnetic head slider used in a conventional magnetic disk device has a floating blade that is aerodynamically generated while a magnetic recording medium rotates, and a predetermined pressing force applied from a magnetic head arm that supports the magnetic head slider. In order to balance
It floats stably while keeping the spacing between it and the magnetic recording surface very small and constant.

A tapered flat slider is a conventional magnetic head slider. This has two rails consisting of a tapered part at the air inflow end and a flat part extending to the air outflow end, and these two rails are provided in parallel on both sides of the slider. This system has two pressure peaks on one rail: the boundary between the tapered part and the flat part, and the outflow end.The magnetic head slider is held by a total of four supporting points, and is able to withstand up and down, pitching, and The structure is dynamically stable against rolling motion in three degrees of freedom. Furthermore, a magnetic transducer for applying a magnetic field and detecting a residual magnetic field at at least one outflow end with minimal spacing is formed by lithography.

A recent demand for higher performance in magnetic disk drives is higher recording density. In order to meet the demand for higher recording densities, it is necessary to narrow the spacing and to minimize the surface roughness of the magnetic recording medium surface. In the case of a conventional tapered flat slider with a constant circumferential speed, the method for narrowing the spacing is to reduce the width and length of the rail, which is the air bearing surface, and to increase the pressing force. Conventionally, the C8S method has been adopted in which the magnetic recording medium and magnetic head slider start and stop while in contact with each other, and when the pressing force is increased, the surface pressure increases.
The pressing force cannot be increased from the viewpoint of the wear resistance of the magnetic recording medium. Furthermore, if the ratio of the width and length of the rail is reduced to a constant value and the pressing force is increased, the rigidity of the air film increases, but the damping coefficient decreases and the follow-up characteristics for medium surface undulations and vibrations increase. decreases, and when it falls below a certain pressing load, it becomes negative and self-excited vibration may occur.

Therefore, the most suitable conventional design guideline for narrowing spacing is to reduce the rail width. However, it is necessary to mount a magnetic transducer with a certain finite size on the outflow end of the rail, and there is a limit to reducing the rail width.

In conventional magnetic disk drives, methods for moving the magnetic head slider in the radial direction include a linear method in which the magnetic head slider moves in parallel in the radial direction, a linear method in which the magnetic head slider draws an arc around an arbitrary point, and a linear method in which the magnetic head slider moves in parallel in the radial direction. It uses a rotary system that moves in the radial direction. The present invention is suitable for a rotary system. In a magnetic disk device, the relationship between recording density, transfer speed T9 and circumferential speed U is Da
:T/U, so when the transfer rate is constant, the recording density is maximum at the innermost circumference and minimum at the outermost circumference. Therefore, by increasing the transfer speed toward the outer circumference so that the recording density on the outer circumference is the same as that on the inner circumference, the recording density on the surface of the magnetic recording medium increases. In order to achieve this, the spacing needs to be constant regardless of the radial position. When moving a conventional tapered flat slider located on the inner circumference toward the outer circumference using a rotary method, the circumferential speed increases as it approaches the outer circumference.
Since the yaw angle (the angle between the length direction of the rail and the tangential direction of the circumference of the magnetic recording medium) also increases, the relationship between the radial position and the spacing becomes an upwardly convex curve.

The magnetic head slider described in Japanese Unexamined Patent Publication No. 2-108290 has rounded chamfers formed on four longitudinal edges of two rails provided on the slider to adjust the radial position. Although the spacing can be constant regardless of the yaw angle O.

It is not possible to reduce the spacing when .

Also, JP-A-57-176565, JP-A-57-17
The magnetic head slider described in Publication No. 6566 has a groove provided in a part of the rail, or
The magnetic head slider described in Publication No. 83 has sloped surfaces inclined in the width direction of the rail on two side edges of the slider, and from the viewpoint of pressure at the contact area between the slider and the magnetic recording medium surface, It has a slider shape that does not reduce the spacing even when the yaw angle changes.

Furthermore, conventional magnetic disk drives employ the C8S method when starting and stopping, and in order to improve the wear resistance of the magnetic recording medium surface, a liquid lubricant is applied to the medium surface. Therefore, if the surface roughness of the magnetic recording medium is made smaller, the rail surface and the medium surface tend to stick together when the magnetic recording body stops, and if the rail surface and the medium surface are started in a sticky state, there is a risk of damage to the recording medium surface. be.

[Problem to be solved by the invention]

When using the conventional tapered flat slider mentioned above to minimize the spacing between the slider and the magnetic recording medium surface, it is necessary to mount a magnetic transducer with a certain finite size on the outflow end of the rail. The problem was that there was a limit to how narrow the width could be made.

In addition, in order to increase the transfer speed toward the outer periphery so that the recording density on the outer periphery is the same as that on the inner periphery, the spacing must be constant regardless of the radial position. The relationship between and spacing is an upwardly convex curve.

In addition, if the surface roughness of the magnetic recording medium surface is made smaller, the contact area between the rail surface and the medium surface when the magnetic recording body stops increases, making it easier to cause adhesion. The problem was that there was a risk of damage to the

The purpose of the present invention is to
The goal is to miniaturize the spacing.

Furthermore, when moving the magnetic head slider in the radial direction using a rotary method, the spacing must be constant regardless of the radial position. Furthermore, the contact area between the rail surface and the medium surface when the magnetic recording medium is stopped can be reduced.

[Means to solve the problem]

In order to achieve the above object, the magnetic head slider of the present invention has a flat surface inclined in the width direction of the rail on at least a part of the rail provided on the magnetic head slider,
The slope is configured to face either rightward or leftward with respect to the center line along the rail of the magnetic head slider.

[Effect]

By forming the sloping flat section as an air bearing surface, air entering from the inlet end is more likely to escape from the side of the rail, reducing the pressure generation efficiency of the flat section and reducing spacing. Furthermore, if the length direction of the rail differs from the tangential direction to the circumference of the magnetic recording medium, air will enter the inclined plane part that becomes the air bearing surface, and depending on the angle and area of the inclined plane, the pressure distribution and levitation will be affected. The blade, pressure center position, and spacing change.

〔Example〕

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

FIG. 1 shows a magnetic head slider according to an embodiment of the present invention.

Rails 2a and 2b are provided in parallel along both sides of the magnetic head slider 1, and the rail 2a.

2b denotes flat portions 3a and 3b that can serve as air bearing surfaces inclined in the length direction of the rail; flat portions 4a and 4b that extend to the outflow end of the rail that can serve as air bearing surfaces in the width direction of the rail; Flat parts 5a and 6a that can serve as bearing surfaces.

It is composed of 5b and 6b. In addition, the flat parts 4a, 4
b are inclined in the same direction. As shown in the figure, each corner of the rail is designated as a point A-J, ABCD are on the same line, and a line segment HI representing the inclination of the flat portions 4a and 4b is designated as δ. Also, 4a.

Let the length of 4b be 1 and the rail width be Sw. A magnetic hent slider according to an embodiment of the present invention with another orientation of the inclined planar portions 4a, 4b is shown in FIG.

3 and 4 show pressure distributions of the magnetic head slider of FIG. 1 and a conventional tapered flat slider, respectively.

As can be seen by comparing the two, it can be seen that the pressure distribution on surfaces 4a and 4b has decreased. It can also be seen that the pressure distribution in the GC cross section is tilted to the right.

Figure 5 shows the relationship between the circumferential speed and the spacing and clearance ratio at the outflow end (the ratio of the spacing h2 at point J and the spacing h□ at point E) when δ = 0.2 μm in Figure 1. This figure shows a magnetic head slider and a conventional tapered flat slider. From the figure, it can be seen that the spacing of the magnetic head slider of FIG. 1 is smaller than that of the conventional tapered flat slider at the same posture. The magnetic head slider shown in FIG. 2 also shows exactly the same circumferential speed dependence of spacing. This makes it easier for air entering from the inflow end to escape from the side of the slider, 4a.

4b plane, pressure generation efficiency decreases and spacing decreases. Therefore, spacing can be reduced without narrowing the slider width.

Figure 6 shows the relationship between yaw angle and spacing in Figures 1 and 2.
The figure shows a comparison between a magnetic head slider and a conventional tapered flat slider. The spacings are those at the outflow ends of the two rails. To distinguish between the two rails,
INNER the inner and outer rails respectively.
Rail (2a).

01JTER rail (2b). The yaw angle is the angle θ between the longitudinal direction e of the reel and the tangential direction d of the circumference of the magnetic recording medium C, as shown in FIG. From FIG. 6, it can be seen that in the conventional tapered flat slider and the magnetic head slider in FIG. 1, the spacing decreases as the yaw angle increases, but in the magnetic head slider in FIG. 2, on the contrary, the spacing increases.

This is because, due to the yaw angle, air also enters the flat parts 4a and 4b that are inclined in the width direction of the rail. In this way, in the magnetic head sliders shown in FIGS. 1 and 2, by appropriately adjusting the length Q of the surfaces 4a and 4b and δ representing the degree of inclination thereof, the spacing with respect to the yaw angle can be arbitrarily adjusted. Can be set. for example,
As shown in Fig. 8, from the position where the inner peripheral speed is 15 yn/s and the yaw angle is 0°, the outer peripheral speed is 20 m/s and the yaw angle is 5°.
When moving the magnetic head slider to the position using a rotary method, the spacing increases with a conventional tapered flat slider, but with the magnetic head slider with δ = 0.1 μm in Figure 1, the spacing remains constant. It can be done.

Further, in the case of a conventional tapered flat slider, the contact area with the magnetic recording medium surface is the ABEJ surface, but in the magnetic head slider of FIG. 1, it is 5a.

5b, 6a, and 6b surfaces, and the contact area can be significantly reduced.

As described above, according to the present invention, (1) The spacing can be miniaturized without increasing the pressing load or reducing the slider width.

(2) When the magnetic head slider is moved in the radial direction using a rotary method, the spacing can be kept constant regardless of the radial position, and high recording density can be achieved.

(3) Since the contact area with the surface of the magnetic recording medium can be reduced, adhesion can be prevented.

An inclined plane portion 4a of the magnetic head slider l.

For the processing method 4b, conventional ultra-precision machining and microfabrication technology (phosphorography technology) for LSI manufacturing are applied.

At this time, it is also possible to process the inclined surface into a step-like shape.

〔Effect of the invention〕

According to the present invention, (1) The spacing can be miniaturized without increasing the pressing load or reducing the slider width.

(2) When the magnetic hent slider is moved in the radial direction using a rotary method, the spacing can be kept constant regardless of the radial position, and high recording density can be achieved.

(3) Since the contact area with the surface of the magnetic recording medium can be reduced, adhesion can be prevented.

The above is possible, and it is effective in providing a magnetic head slider and a magnetic disk device that are excellent in narrow spacing, high recording density, and high reliability.

[Brief explanation of drawings]

1 and 2 are perspective views showing magnetic bed sliders according to embodiments of the present invention, FIG. 3 is a pressure distribution diagram of the magnetic head slider of FIG. 1, and FIG. 4 is a diagram of a conventional tapered flat slider. FIG. 5 is a graph showing the relationship between circumferential speed, outflow end spacing, and clearance ratio for the magnetic head slider in FIG. 1 and a conventional tapered flat slider. FIG. Figures 1 and 2 are graphs showing the relationship between the yaw angle and spacing for the magnetic head slider and the conventional tapered flat slider. Figure 7 is a conceptual diagram for explaining the yaw angle. Figure 8 is , is a graph diagram showing changes in spacing when moving from the inner circumferential side to the outer circumferential side for the magnetic head slider of FIG. 1 and a conventional tapered flat slider. 1...Magnetic head slider of the embodiment of the present invention, 2a. 2a, 2b...Rail, 3a, 3b...Flat part inclined in the length direction of the rail, 4a, 4b...Extends to the outflow end of the rail excluding the plane part inclined in the length direction of the rail. Flat parts provided on the flat part and inclined in the width direction of the rail, 5a, 6a, 5b, 6b...Flat parts that can serve as air bearing surfaces of the rail, A to J...Each corner of the rail, δ... A line segment H1 representing the inclination of the plane parts 4a and 4b
, Q...Length of flat parts 4a, 4b, Sw...Rail width, e...Rail length direction, ME 11!1 2nd degree mouth 3rd figure 4 figure 5th mouth ( $lS) '4bi yo^(6) non q cause

Claims (1)

[Claims] 1. A magnetic transducer is mounted facing the magnetic recording medium, and in order to aerodynamically levitate the magnetic transducer above the surface of the magnetic recording medium, the air inflow direction at the air inflow end is adjusted. a magnetic head slider that is provided with at least two rails having two surfaces, a flat surface that is inclined at a slope and a flat surface that extends to an air outflow end; and a magnetic head that presses and supports the magnetic head slider with a predetermined load. In a magnetic disk drive comprising: an arm; and means for moving the magnetic head arm in a radial direction of the magnetic recording medium in order to position the magnetic transducer mounted on the magnetic head slider, at least a portion of the rail; 1. A magnetic disk drive characterized in that a rail is provided with a flat portion inclined in the width direction of the rail, and the flat portions inclined in the width direction of the rail are oriented in the same direction. 2. A slider that aerodynamically floats close to a disk-shaped recording medium and has two rails substantially parallel to the track direction of the recording medium, and a transducer mounted on the end of the rails, A slider characterized in that the two rails have slopes inclined in the width direction of the rails, and the slopes face either an inner periphery or an outer periphery of the recording medium.