JPH06168557A - Magnetic head and magnetic disk device - Google Patents

Abstract

PURPOSE:To provide the magnetic head which does not damage the surface of a disk medium even at a low floating quantity and has good reliability in order to design the stationary magnetic disk device of a high recording density. CONSTITUTION:This magnetic head is constituted of a slider 1, an electromagnetic conversion part 2 and a coil 3. A surface rugged layer 4 having microruggedness on a diskmedium facing surface 5 of the slider 1 is formed of a sputtered film consisting of a low melting metal or alloy. This surface rugged layer 4 is otherwise formable by a mechanical polishing method as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic disk device or the like.

[0002]

2. Description of the Related Art In recent years, magnetic disk devices have been widely used as external storage devices for information processing devices such as computers. As is well known, the writing / reading (hereinafter referred to as R / W) portion of the data of the current fixed magnetic disk device includes a disk medium having a thin film layer 7 formed on a substrate 6 and a slider 1 as shown in FIG. , A magnetic head composed of the electromagnetic conversion unit 2 and the coil 3, the surface of the disk medium is in line contact with the magnetic head when the apparatus is stopped, and an air flow 11 generated when the disk medium rotates in the rotation direction 10
The contact start / stop method (hereinafter referred to as CSS) in which the magnetic head is levitated by the above and secures the flying height 9 is generally adopted. In order to prevent the deterioration of CSS characteristics caused by the sliding of the magnetic head and the surface of the disk medium due to the start and stop of this device, and to properly maintain the flying height of the magnetic head in the R / W section. Therefore, texturing, which is a general mechanical polishing method, is performed on the surface of the substrate 6 shown in FIG. 3 to roughen the substrate surface. In this texturing, fine grooves are formed in the circumferential direction of the substrate to form irregularities on the surface.

With this texturing technology, C
After 20,000 SS, the coefficient of friction is 0.6 or less, the flying height is 0.2 to 0.1 μ
m fixed magnetic disk drive is provided. The CSS characteristic (slide μ) of the conventional magnetic head is shown in FIG. 2A and 2B, a is a characteristic of a magnetic head having a smooth disk medium facing surface according to the prior art, and b is a characteristic of the magnetic head of Examples 1 and 2, respectively.

[0004]

Recently, downsizing of magnetic disk devices has been required, and in order to meet this demand, the flying height must be reduced to increase the linear recording density of the disk medium. In order to provide a fixed magnetic disk device that further improves the CSS characteristics and reduces the flying height by the above-mentioned texturing technique and is compatible with high density, the following problems occur.

The reduction of the flying height can be achieved by completely smoothing the surface of the disk medium.
On the contrary, the unevenness on the surface of the disk medium disappears, the friction coefficient between the magnetic head and the surface of the disk medium increases, and the magnetic head and the disk medium are damaged. Further, when the disk medium starts to rotate, the magnetic head and the disk medium are attracted to each other, so that the disk medium is not smoothly rotated, and the surface of the disk medium is damaged.

That is, if the CSS characteristic is improved only by the current texturing technique, the flying height cannot be lowered, and if the low flying height is secured, the CSS characteristic is deteriorated. An object of the present invention is to provide a highly reliable magnetic head in which the magnetic head and the surface of the disk medium are not damaged even when the flying height is low, and a magnetic disk device incorporating the magnetic head.

[0007]

The above object can be achieved by forming a surface having a minute unevenness, that is, a surface unevenness layer on the surface of the slider facing the disk medium. In addition, the surface with this minute unevenness, the surface uneven layer is a general mechanical polishing method,
It is realized by forming a low melting point metal such as Al, Bi or Ti by a sputtering method, or forming an alloy containing at least one kind of Al, Bi or Ti by a sputtering method.

[0008]

According to the above structure, even if the surface roughness of the disk medium is made smoother in order to reduce the flying height in the R / W section, the magnetic head and the disk medium surface in the CSS section are
Since they are in point contact with each other on the surfaces having minute irregularities and are stopped, the synergistic effect reduces the friction coefficient, and the adsorption between the magnetic head and the disk medium is reduced even after starting after being left for a long time.

[0009]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a surface uneven layer 4 is provided on the disk medium facing surface 5 of the smooth slider 1. Hereinafter, the surface uneven layer 4
The method for forming the above will be described in detail. Example 1 A disk medium facing surface 5 of a slider 1 having a smooth surface was set in a sputtering device so as to face a target material, the degree of vacuum in the sputtering device was set to 3 × 10 ⁻⁶ Torr or less, and then the vacuum was applied. Al in an Ar gas atmosphere of 50 mTorr
Target material is sputtered to form a 30 nm thick Al film.
Form a thin film. The center line average roughness of the Al thin film at this time is 3 nm.

The CSS characteristic of the magnetic head obtained as a result is shown in FIG. Example 2 The Ar gas atmosphere of Example 1 was changed to an Ar + 5% N ₂ atmosphere, and sputtering was performed without changing other conditions.
l Form a thin film. The center line average roughness of the Al thin film at this time is 2 nm.

The CSS characteristics of the magnetic head obtained as a result are shown in FIG. The CSS characteristics are improved as compared with the magnetic head of the first embodiment. The first and second embodiments can be freely selected according to the required quality. Although Al is used as the target material in the above examples, similar results can be obtained by using Bi, Ti and their alloy materials.

The surface uneven layer 4 may be a magnetic head having an uneven layer formed on the disk medium facing surface 5 by a mechanical polishing method such as tape polishing or honing.

[0013]

As described above, when the magnetic head according to the present invention is used, the magnetic head and the disk medium are not damaged even with a low flying height, and a magnetic disk device with a higher recording density can be designed.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.

FIG. 2 shows a CS of a magnetic head according to the present invention and the prior art.
Comparison of S characteristics (slide μ)

FIG. 3 is a conceptual diagram of a conventional R / W unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 slider 2 electromagnetic conversion part 3 coil 4 surface uneven layer 5 disk medium facing surface 6 substrate 7 thin film layer 8 disk medium surface 9 flying height 10 disk medium rotating direction 11 air flow

Claims (5)

[Claims] 1. A magnetic head comprising an electromagnetic conversion portion having a slider and a coil adjacent to the slider, wherein a surface of the slider facing the disk medium surface is formed by a surface having minute irregularities. Magnetic head. 2. A magnetic head according to claim 1, wherein the uneven surface is formed of a sputtered film of a low melting point metal or alloy. 3. The magnetic head according to claim 1, wherein the uneven surface is formed by a mechanical polishing method. 4. A magnetic head according to claim 2, wherein the uneven surface is formed of a sputtered film of an alloy containing at least one of Al, Bi and Ti. 5. A magnetic disk device comprising the magnetic head according to any one of claims 1 to 4.