JPS62109217A - Magnetic disk - Google Patents

Abstract

PURPOSE:To obtain a high-performance disk having excellent lubricity and wear resistance by providing a film essentially consisting of a laminar lattice structure material contg. metals on the surface part thereof. CONSTITUTION:Thin magnetic films 2 formed on a substrate 1 consisting of a disk-shaped Al-Mg alloy consist, for example, of gamma-Fe2O3. >=1 kinds among any of Cr, Cu, Al, Ti, V, Zr, Ta, In, Au, Ag, Pt, etc. are used for the metal and any one kind among MoS2, WS2, NbS2, WSe2, MoSe2, (CFx)n, C, BN, phthalocyanine, etc. is used for the laminar lattice structure material with the film 3 essentially consisting of the laminar lattice structure material contg. metals. The content of the metal is preferably <=20at% and the coefft. of friction increases if the content is excessively high.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] This invention relates to a magnetic disk having a film for lubricating and protecting the magnetic disk.

[Prior Art J] In order to increase the recording density of a magnetic disk, it is necessary to reduce the film thickness and surface roughness of the magnetic recording medium.

Although magnetic thin films satisfy these requirements, they have the disadvantage that they are mechanically weaker than conventional coated films, and cannot be impregnated with lubricant. Therefore,
(It is necessary to form a film having lubricating and protective effects on the a-based thin film. Naturally, such a film is necessary.

Although the film must be extremely thin and have a strong adhesive force with the magnetic thin film, there are almost no films that meet these conditions, which has been a factor that has hindered the increase in the density of magnetic disks.

As a conventional lubricating protective film 2, for example, JP-A-53-1
The carbon film shown in Japanese Patent No. 43206.

There is ML382 shown in Lubrication, 26-8, P, 587 (1981).

[Problem to be solved by the invention J As mentioned above, conventional magnetic disks have a layered lattice structure thin film such as a carbon film or MoS2 on the surface as a lubrication protective film, but these films have poor lubrication performance. Although good, there were problems with durability, mechanical strength, etc. That is,
The main reason for the good lubrication performance is thought to be that the crystal structure is a layered lattice, but on the other hand, it is easily broken by forces parallel to the film surface, and therefore has low wear resistance. Furthermore, the adhesion force was often weakened depending on the surface oxidation state of the magnetic thin film, and there was a tendency for the lubricating protective film to peel off easily.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic disk with excellent lubricity and wear resistance, and with high reliability and read performance.

[Means to Solve All Problems J] The magnetic disk according to the present invention has one surface provided with a film whose main component is a layered lattice structure containing metal.

[Effect]

The metal in this invention is dissolved in the two-layer lattice structure material to increase the bonding strength between the nine elements and between crystal grains.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the figure, (1) is a disk-shaped substrate 2, for example, Al-M
Made of g-alloy. (2) is a magnetic thin film formed on this substrate (1), and is made of, for example, γ-Fe2O3. (3) is a film whose main component is a layered lattice structure substance containing metals, and the metals include Cr, Cu, Al, and T.
i.

V + Z r + Ta + In r Au r
kg+P, etc. The two-layer lattice structure material is MoS2, WS2.

NbS2, WSe2, MoSe2, (CF
'x) Any one of n, C, BN, phthalonanine, etc. is used. Also.

If the metal content is less than 20 at%, it will be unpleasant, and if it is more than 2 at%, the coefficient of friction will increase.

Next, specific examples will be described together with comparative examples that do not contain metal.

A MoS2 thin film containing 5 at-A of Cr was formed on the surface of the magnetic thin film (2) formed on the substrate (1) by sputtering. When this magnetic disk was brought into contact with a magnetic head and the coefficient of friction was measured, a very small value of 0.10 was obtained. In addition, the contact start/stop (aSS) test, which is commonly performed as a wear resistance and durability test for magnetic disks, passed 20,000 cycles, with no scratches or film peeling.

<Example 2> On the surface of the magnetic thin film (2) formed in the same manner as in Example 1,
A BN thin film containing 1 Qat% of p and Ti was formed by sputtering. In this case, a sufficiently low coefficient of friction of 0.13 was obtained, and the C8S test was passed 20,000 times without any scratches or peeling of the film.

<Comparative example> On the surface of the magnetic thin film (2) formed in the same manner as in Example 1,
A MoS2g film was formed by sputtering. In this case, the coefficient of friction was as small as 0.12, but in the CSS test, scratches appeared after about 100 cycles, and a head crash occurred after about 1,000 cycles.

In addition, in the above-mentioned implementation example, a case is shown in which one type of metal is included, but the same effect as in the above embodiment can be expected even when multiple types of metal are included.

〔Effect of the invention〕 As described above, according to the present invention, there are two parts on one surface.

Since the coating is mainly composed of a layered lattice structure containing metal, it is possible to obtain a disc with excellent braking performance and excellent wear resistance.

[Brief explanation of drawings]

The drawing is a front view showing a magnetic disk according to an embodiment of the present invention. In the figure, (1) is the substrate, (2) is (1a thin film, (
3) is a film.

Claims (4)

[Claims] (1) A magnetic disk characterized in that a film whose main component is a layered lattice structure material containing metal is provided on the surface portion. (2) The magnetic disk according to claim 1, wherein the metal content is 20 at% or less. (3) Layered lattice structure materials are MoS_2, WS_2, Nb
S_2, WSe_2, MoSe_2, (CFx)n, C
The magnetic disk according to claim 1 or 2, which is any one of , BN, and phthalocyanine. (4) Metals are Cr, Cu, Al, Ti, V, Zr, Ta
, In, Au, Ag, and Pt, the magnetic disk according to any one of claims 1 to 3.