JPH0620269A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To prevent attraction between a magnetic recording medium and a magnetic head. CONSTITUTION:A plating layer 2 of Ni, Ni-P, Cu, Ni-Cu-P, or the like is formed on an aluminum substrate 1. Mechanical polishing is then applied on the surface and irregularities are formed on the surface of the plating layer 2 through immersion into a solution and a Co-P magnetic layer 3 is formed thereon through electroless plating. Tetrahydroxysilane [Si(OH)4] or the like is then applied through spin coating and burnt to form a protective film layer 4. A fluorooil based lubricant is then applied through spin coating onto the protective film thus forming a lubricant film layer 5. A magnetic disc medium thus produced has reduced static frictional coefficient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a magnetic recording medium used in a magnetic disk device, and more particularly to a substrate processing technique for forming irregularities on a substrate to roughen the substrate surface.

[0002]

2. Description of the Related Art In recent magnetic disk media, a thin film magnetic disk using a magnetic thin film formed by a plating method, a sputtering method, an evaporation method or the like as a magnetic recording layer is becoming mainstream in order to achieve a high recording density.

In such a thin film magnetic disk medium, in order to prevent the magnetic head and the magnetic disk from being attracted to each other, a Ni alloy plating layer is conventionally formed on a substrate such as an aluminum substrate,
A substrate whose surface is mechanically polished is used.

[0004]

As described above, in the method of forming a rough surface by polishing in the conventional method for manufacturing a magnetic recording medium, a relatively large abrasive grain in the polishing abrasive grains or a foreign substance mixed in during polishing is used. It is difficult to obtain a uniform and appropriate surface roughness over the entire surface of the disk because thick polishing streaks that cause signal errors are likely to occur.

Further, in mechanical polishing, the obtained surface roughness is almost determined by the size of the abrasive grains used, and therefore the surface roughness cannot be finely controlled,
It is difficult to increase the density of polishing streaks.

Therefore, in order to prevent the attraction of the magnetic head, it is necessary to make the surface roughness considerably large, which may cause a signal error at the time of R / W and a decrease in the durability of the magnetic disk. There are drawbacks.

The object of the present invention is to provide on an aluminum substrate,
After a hard film of any one of Ni, Ni-P, Cu, and Ni-Cu-P is provided, a substrate on which unevenness is formed by chemical etching is used, and a magnetic film, a protective film, and a lubricant are provided on the substrate. It is an object of the present invention to provide a method for manufacturing a magnetic recording medium which eliminates the above-mentioned drawbacks by forming a film to manufacture a magnetic recording medium and which is hard to be attracted to a magnetic head.

[0008]

The method of manufacturing a magnetic recording medium according to the present invention comprises: Ni, Ni-P, C on an aluminum plate.
A hard film of either u or Ni-Cu-P is provided, chemical etching is performed on the hard film to form irregularities on the surface, and a magnetic disk medium is manufactured using the substrate as a substrate.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view of a magnetic recording medium manufactured by using the method of manufacturing a magnetic recording medium according to an embodiment of the present invention. FIGS. 1A to 1C are magnetic recording media in each manufacturing process. FIG.

In this embodiment, as shown in FIG.
First, the Ni-P plating layer 2 is formed on the aluminum substrate 1 to have a film thickness of 15 μm. After mechanically polishing this surface, it is immersed in a 10% nitric acid solution for 5 minutes to form irregularities on the surface of the Ni-P plating layer 2 as shown in FIG. 1 (b).

Further, as shown in FIG. 1 (c), a Co-P magnetic layer 3 is formed on the upper portion by electroless plating. Then, tetrahydroxysilane [Si (O
H) ₄ ] is applied by spin coating to a thickness of about 600 Å and baked to form the protective film layer 4. Then, a lubricating oil layer 5 is formed by spin-coating a fluorine oil-based lubricant on the protective film.

Table 1 shows the friction coefficient measurement results of the magnetic disk medium according to this embodiment and the conventional magnetic disk medium.

A magnetic head made of Mn-Zn was used as the magnetic head, and the static friction coefficient was measured immediately after the magnetic head was loaded on the magnetic disk medium and after being left for 48 hours.

[0015]

[Table 1]

As described above, the magnetic disk medium of this embodiment has a small static friction coefficient after standing for 48 hours, and has a remarkable effect of preventing adsorption.

[0017]

As described above, according to the method of manufacturing a magnetic recording medium of the present invention, Ni, N is formed on an aluminum substrate.
After a hard film of any one of i-P, Cu, and Ni-Cu-P is provided, a substrate on which unevenness is formed by chemical etching is used, and a magnetic film, a protective film, and a lubricating film are formed on the substrate. By forming the magnetic recording medium and manufacturing the magnetic recording medium, it is possible to prevent adsorption to the magnetic head.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a magnetic recording medium manufactured using a method of manufacturing a magnetic recording medium according to an embodiment of the present invention. Figure 1
(A)-(d) is sectional drawing of the magnetic recording medium in each manufacturing process.

[Explanation of symbols]

 1 Aluminum Substrate 2 Ni-P Plating Layer 3 Pd Compound Particles 4 Ni-P Plating Layer 5 Co-P Plating Layer 6 Protective Film Layer 7 Lubrication Film Layer

[Procedure amendment]

[Submission date] September 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a magnetic recording medium manufactured using a method of manufacturing a magnetic recording medium according to an embodiment of the present invention. Figure 1
(A)-(c) is sectional drawing of the magnetic recording medium in each manufacturing process.

[Explanation of Codes] 1 Aluminum substrate 2 Ni-P plating layer 3 Pd compound particles 4 Ni-P plating layer 5 Co-P plating layer 6 Protective film layer 7 Lubrication film layer

Claims (1)

[Claims] 1. Ni, Ni-P, C on an aluminum plate
A magnetic recording medium, characterized in that a hard film of either u or Ni-Cu-P is provided, chemical etching is performed on the hard film to form irregularities on the surface, and a magnetic disk medium is manufactured using this as a substrate. Manufacturing method.