JPH0423222A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To provide the process for producing the magnetic recording medium which can form uniform ruggedness on a nonmagnetic substrate by polishing the substrate and subjecting the substrate to electroless plating of Ni-P after the polishing, then forming a magnetic film and a protective film. CONSTITUTION:The aluminum substrate is first polished and is washed and dried after the end of the polishing The aluminum substrate is subjected to the electroless plating of the Ni-P and is washed and dried after the end of the plating. The substrate is then polished to beautifully finish the plating surface and is washed and dried after the end of the polishing. The magnetic film is thereafter formed by sputtering on the substrate and in succession, the protective film consisting of carbon is formed on the magnetic film by sputtering. The head burnishing to remove microprojections by using the magnetic head set at the lower floating quantity than the actually set floating quantity of the magnetic head is executed. Finally, a lubricant is applied on the surface in order to decrease friction.

Description

[Detailed Description of the Invention] [Summary] An object of the present invention is to provide a method for manufacturing a magnetic recording medium that can form uniform irregularities on a substrate, and to provide a method for manufacturing a magnetic recording medium that can form uniform irregularities on a non-magnetic substrate. Polishing is performed, and after polishing, Ni--P electroless plating is performed, and then a magnetic film and a protective film are formed.

[Industrial application fields] The present invention relates to a method of manufacturing a magnetic recording medium.

In recent years, in magnetic disk devices using magnetic storage media, it has been desired to lower the flying height of the head and to prevent the head from adhering to the CSS zone. Therefore, in magnetic recording media, management of surface thickness is important.

[Prior Art] Next, a conventional example will be explained using the drawings. FIG. 6 is a flow diagram illustrating a conventional method of manufacturing a magnetic recording medium.

In the figure, first, electroless plating of Ni--P is performed on an aluminum substrate (step).

After plating is completed, cleaning and drying are performed (step 2).

Next, polishing is performed to give a beautiful finish to the plated surface (Step 3).

After polishing, wash and dry (Step 4)
).

Next, a tape polishing process called texturing process is performed (step 5). This processing is performed to adjust the surface roughness on the substrate.

After texture is finished, wash and dry (Step 6)
).

Next, a magnetic film is formed on the substrate by sputtering (step 7).

Subsequently, a carbon protective film is formed on the magnetic film by sputtering (step 8).

Then, using a magnetic head whose flying height is set lower than the actually set flying height of the magnetic head, head vanishing is performed to remove minute protrusions (step 9).

Finally, a lubricant is applied to reduce friction (step 10).

[Problems to be Solved by the Invention] FIG. 7 is a diagram showing an example of the surface roughness of the substrate after the texturing in step 5 in FIG. 6 is performed.

As shown in the figure, the concave portions protrude more than the center line average roughness line, and there is a problem in that it is difficult to create uniform unevenness.

The present invention has been made in view of the above problems, and an object thereof is to provide a method for manufacturing a magnetic recording medium that can form uniform irregularities on a substrate.

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle of the present invention. In the figure, step 11 is a step of polishing a non-magnetic substrate, step 12
Step 13 is a step of performing electroless Ni--P plating after polishing, and step 13 is a step of forming a magnetic film and a protective film.

[Function] In the method for manufacturing a magnetic recording medium shown in FIG. 1, a nonmagnetic substrate is first polished and then electroless plated with Ni--P. At this time, more plating is applied to the concave portions than to the convex portions, forming uniform irregularities. and,
A magnetic film and a protective film are formed.

[Example] Next, an example of the present invention will be described using the drawings. Second
The figure is a flowchart explaining one embodiment of the method for manufacturing a magnetic recording medium of the present invention, FIG. 3 is a diagram showing an example of the surface roughness of the aluminum substrate before polishing in step 21 of FIG. 2, and FIG. is a diagram showing an example of the surface roughness of an aluminum substrate after polishing in step 21 of FIG. 2, and FIG.
2 is a diagram showing an example of the surface roughness after Nj-P plating in No. 2. FIG.

First, the manufacturing flow of this embodiment will be explained using FIG. In the figure, first, the aluminum substrate is polished (
Step 21).

After polishing is completed, cleaning and drying are performed (step 22).

Next, electroless plating of Nj-P is performed on the aluminum substrate (step 23).

After plating is completed, cleaning and drying are performed (step 24).

Next, polishing is performed to finish the plated surface beautifully (step 25).

After polishing, wash and dry (Step 2)
6).

Next, a magnetic film is formed on the substrate by sputtering (step 27).

Subsequently, a carbon protective film is formed on the magnetic film by sputtering (step 28).

Then, using a magnetic head whose flying height is set lower than the actually set flying height of the magnetic head, a process for removing minute protrusions is performed (two steps).

Finally, a lubricant is applied to reduce friction (step 30).

According to the above manufacturing method, when an aluminum substrate having a surface roughness as shown in FIG. 3 is polished, the surface roughness becomes as shown in FIG. 4. When Ni-P plating is performed here, as shown in Figure 5, more plating is applied to the four parts than to the convex parts, so compared to the conventional method, uniform unevenness is formed on the aluminum substrate. can do.

[Effects of the Invention] As explained above, according to the present invention, polishing is performed on a non-magnetic substrate, electroless plating of JLI-P is performed after polishing, and then a magnetic film and a protective film are formed. By doing so, it is possible to realize a method for manufacturing a magnetic recording medium that can form uniform irregularities on a substrate.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a flow diagram illustrating an embodiment of the method for manufacturing a magnetic recording medium of the present invention, and Fig. 3 is a diagram of the aluminum substrate before polishing in step 21 of Fig. 2. FIG. 4 is a diagram showing an example of the surface roughness of the aluminum substrate polished in step 21 of FIG. 2, and FIG. 5 is a diagram showing an example of the surface roughness of the aluminum substrate polished in step 22 of FIG.
-A diagram showing an example of surface roughness after P plating; Figure 6 is a flow diagram explaining a conventional method of manufacturing a magnetic recording medium; Figure 7 is a substrate after texturing in step 5 in Figure 6; It is a figure showing an example of surface roughness of.

Claims (1)

[Claims] Polishing is performed on a nonmagnetic substrate (step 11), and after polishing, electroless plating of Ni-P is performed (step 12). Then, a magnetic film and a protective film are formed (step 13). A method of manufacturing a magnetic recording medium, characterized in that: