JPH01171101A - Magnetic recording system - Google Patents

Abstract

PURPOSE:To realize the stabler low floating of a magnetic head slider and to improve the reliability of a magnetic recording device by combining a magnetic recording medium applied with a lubricant on a magnetic recording surface with a magnetic head slider having a floating surface applied with the lubricant having a polar group which has not affinity or small affinity with the lubricant applied to the magnetic recording surface. CONSTITUTION:The magnetic recording medium applied with the lubricant consisting of, for example, stearic acid ester, etc., on the magnetic recording surface is combined with the magnetic head slider, on the floating surface of which the lubricant that has not the affinity with the lubricant applied to the magnetic recording surface such as fluorocarbon having the polar group consisting of OH-groups is suction-applied. Consequently, the lubricant from the lubricating film on a magnetic disk device 21 side can be prevented from being attached on the floating surface of a magnetic head slider 23, and since the lubricant on the floating surface is intensively sucked, it cannot be prevented from being worn by friction. Thus, the reliability of the magnetic recording device can be improved.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a magnetic recording method that stabilizes recording and reproduction in magnetic disk devices or magnetic tape devices, and improves the friction and abrasion resistance of magnetic heads. There is no wear due to contact friction on the air bearing surface of the Herad slider.
A magnetic recording system in which lubricant is coated on the magnetic recording surface, aiming at a magnetic recording method using a combination of a highly reliable magnetic disk medium and a magnetic helad slider that prevents lubricant from adhering to the air bearing surface from the medium side. A magnetic head comprising a slider having an air bearing surface coated with a lubricant having no or low affinity with the lubricant applied to the medium and the magnetic recording surface, or a lubricant having a polar group. Configure to combine.

[Industrial application field]

The present invention relates to a magnetic recording system that stabilizes recording and reproduction in a magnetic disk device or magnetic tape device, and improves the friction and wear resistance of a magnetic head.

In recent years, the density of magnetic disk devices, magnetic tape devices, etc. has been increased, and for example, magnetic recording media (hereinafter referred to as magnetic disk media) of magnetic heads equipped with sliders (hereinafter referred to as magnetic sliders) in magnetic disk devices have been promoted. ) is becoming smaller and smaller, but as a result, the probability that the magnetic slider will come into contact with the magnetic disk medium increases, making head crashes more likely to occur. For this reason, a protective lubricant film is provided on the surface of the magnetic disk medium to provide lubricity and impact resistance.

However, the lubricant from the lubricant film provided on the magnetic disk medium adheres to the air bearing surface of the RAD slider due to the magnetic field during recording and reproduction.
If the lubricant is deposited, the flying state becomes unstable, and in the worst case, it may cause a head crash. Therefore, there is a need for a structure in which the lubricant applied to the magnetic disk medium does not adhere to the flying surface of the magnetic helad slider.

[Conventional technology]

In a conventional magnetic disk device, as shown in FIG. 2, a plurality of magnetic disk media 1 each having a lubricant such as stearate (not shown) applied to each medium surface are connected to a spindle motor 3 via a hub mechanism 2. A magnetic head, that is, a magnetic herad slider 4, is attached to the magnetic disk medium 1 and is equipped with a slider whose air bearing surface facing the medium is coated with a lubricating film made of a fluororesin such as polytetrafluoroethylene (not shown). is held by, for example, an access arm 5 supported by a swing arm actuator 6. Further, these components are sealed in an airtight container 7 for dustproofing.

Each of the magnetic sliders 4 in such a configuration uses a so-called contact start/stop (CSS) method, in which each magnetic slider 4 comes into contact with the surface of the magnetic disk medium at the time of starting and stopping recording and reproduction. During recording and reproduction, the swing arm actuator 6
By driving the slider in a desired angle range, the magnetic slider 4 held by the access arm 5 is moved toward the center of the surface of the rotating magnetic disk medium 1 and floated to a predetermined access position to record information or Playing is in progress.

[Problem that the invention seeks to solve]

By the way, in the conventional magnetic disk device as mentioned above,
As shown in FIG. 3, during recording and reproduction, lubricant made of, for example, stearate ester from the lubricant film 11 provided on the magnetic disk medium 1 adheres to and accumulates on the air bearing surface of the magnetic rad slider 4. In order to solve the problem of unstable floating state, a lubricating film 12 made of fluororesin such as polytetrafluoroethylene (Teflon) is applied to the floating surface of the magnetic herad slider 4. Since the lubricating film is a soft material, it wears out due to the contact friction during the contact start/stop (CSS), which not only loses its original effect of preventing lubricant adhesion, but also reduces its durability. There was also a drawback that the sexual performance also decreased.

In view of the above-described drawbacks of the conventional art, the present invention has been developed to provide a reliable system that eliminates wear due to contact friction of the air bearing surface of a magnetic disk drive with respect to a magnetic disk medium, and prevents lubricant from adhering to the air bearing surface from the medium side. The object of the present invention is to provide a magnetic recording system using a combination of a highly novel magnetic disk medium and a magnetic herad slider.

[Means for solving problems]

In order to achieve the above object, the present invention provides a magnetic recording medium having a magnetic recording surface coated with a lubricant, and a lubricant having a polar group that has no affinity with the lubricant coated on the magnetic recording surface, or a lubricant having a polar group having no affinity with the lubricant coated on the magnetic recording surface. This is a magnetic recording system that combines a magnetic Rad slider with an air bearing surface coated with a lubricant with low susceptibility.

[For production]

In the magnetic recording method of the present invention, for a magnetic recording medium whose magnetic recording surface is coated with a lubricant made of, for example, stearic acid ester, the lubricant coated on the magnetic recording surface is coated with, for example, an OH group that has no affinity with the lubricant coated on the magnetic recording surface. By combining this with a magnetic Herad slider that has a lubricant such as fluorocarbon having a polar group adsorbed and applied to its air bearing surface, the lubricant from the lubricant film on the magnetic disk medium side is applied to the air bearing surface of the Magnetic Heard slider during recording and reproduction. This prevents the lubricant from adhering to the surface, and since the lubricant on the air bearing surface is firmly adsorbed, it will not be worn away by friction.

Incidentally, we compared the contact angle of water on the flying surface of a slider made of Affi (h・TiC) and the flying surface on which a lubricant made of fluorocarbon having an OH group was adsorbed. The results are shown in Table 1 below.

Table 1 Results of a comparative study of the contact angle of stearate on the air bearing surface of a slider made of the same < Al 203 TiC and the air bearing surface on which fluorocarbon having an OH group is adsorbed. are shown in Table 2 below.

Table 2 As is clear from Tables 1 and 2 above, by treating the slider air bearing surface with a lubricant made of fluorocarbon having an OH group, the contact angle of water or a lubricant such as stearate ester is increased. It was confirmed that the lubricant from the magnetic disk medium side could be prevented from adhering to the air bearing surface of the slider, and that the durability of the slider air bearing surface was also improved.

〔Example〕

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

FIG. 1 is a schematic side view showing an embodiment of the magnetic recording system according to the present invention.

In the figure, 21 is a magnetic disk medium, the magnetic recording surface of which is provided with a lubricating film 22 coated with a lubricant made of stearic acid ester.

Further, the air bearing surface of the magnetic herad slider 23 disposed opposite to this magnetic recording surface has a polar group made of an alkyl group that has no affinity with the lubricating film 22 provided on the magnetic recording surface and is strongly attracted to the lubricating film 22. For example, a lubricating film 24 is provided on which a lubricant such as perfluoroalkyl polyether is adsorbed.

The method for forming the lubricant film 24 on the air bearing surface of the magnetic herad slider 23 is to immerse the slider itself in a lubricant made of perfluoroalkyl polyether having the alkyl group for a certain period of time, and then immerse the slider in the lubricant. The lubricant is firmly adsorbed to the air bearing surface by pulling it up further, wiping off excess lubricant, and heating it, thereby forming a lubricant film 24 having a so-called low-energy surface with low surface energy due to chemical bonds, etc. can do.

Therefore, by performing recording and reproducing using such a combination of the magnetic disk medium 21 and the magnetic hent slider 23, the lubricant from the lubricant film 22 side of the magnetic disk medium 21 will adhere to the air bearing surface of the magnetic hent slider 23. This effectively prevents the lubricant from adhering to the magnetic disk medium 21, and since this lubricant film 24 does not wear out, the effect of preventing the lubricant from adhering to the magnetic disk medium 21 can be exerted even during long-term recording and reproduction using the C8S method.

In the above embodiments, a lubricating film made of fluorocarbon having a polar group consisting of an OH group or perfluoroalkyl polyether having a polar group consisting of -C, H, □ groups is provided on the air bearing surface of the magnetic herad slider. Although the present invention is not limited to this example, for example, CH having a -COOH group that has no or low affinity with the lubricating film 22 provided on the magnetic recording surface. :l (CFZ) z-COOI(.

-C, F, CH, .co-Nnz, - having Nl2 group
(CL)z・CP・(CF2)4・C having 5OJ group
H! -SO, Hl and other fluorine-based and CH3 (CHz)/O
Hydrocarbon-based lubricants made of R can also be used, and lubricants having polar groups are particularly effective.

In short, as such a lubricant, it is sufficient to use a lubricant that firmly adheres to the air bearing surface of the magnetic head slider by adsorption, etc., and that has no affinity (hardly has affinity) with any lubricant on the magnetic disk medium side. .

〔Effect of the invention〕

As is clear from the above explanation, according to the magnetic recording method according to the present invention, there is no wear of the lubricating film of the magnetic herad slider, so the durability of the air bearing surface is improved, and the air bearing surface of the magnetic herad slider is improved. Since the adhesion of lubricant from the magnetic disk medium side is sufficiently prevented, a more stable and low flying height of the magnetic rad slider can be realized, and the reliability of the magnetic recording device using this magnetic recording method is improved. Can be done.

Therefore, when applied to a C3S type magnetic disk device, the present invention has an excellent advantage in that the effect of preventing lubricant from adhering to the air bearing surface of the magnetic herad slider from the magnetic disk medium side is significantly exhibited during long-term recording and reproducing.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an embodiment of the magnetic recording method according to the present invention, Fig. 2 is a cross-sectional view of essential parts showing an example of a conventional magnetic disk device, and Fig. 3 explains the conventional magnetic recording method. FIG. In FIG. 1, 21 is a magnetic disk medium, 22 is a medium-side lubricating film, 23 is a magnetic rad slider, and 24 is a slider-side lubricating film. Figure 1 Le J! ! De't 17 families one by one and Saitan club new face m
゛Figure 2-4 vines F-, I'' 114. t&eme slts consideration 11
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Claims (2)

[Claims] (1) A magnetic recording medium (21) whose magnetic recording surface is coated with a lubricant (22), and a magnetic recording medium (21) whose magnetic recording surface is coated with a lubricant (22);
22) A magnetic recording system characterized in that it is combined with a magnetic head (23) having a slider having an air bearing surface coated with a lubricant (24) that has no or low affinity for. (2) According to claim (1), the lubricant (24) applied to the air bearing surface of the magnetic head (23) equipped with the slider is made of a lubricant having a polar group. magnetic recording method.