JPS60119635A - Manufacture of magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a medium excellent in traveling efficiency by irradiating laser light locally on the surface of a foundation layer to cause sputtering and providing concavities on the surface. CONSTITUTION:The foundation layer 2 is formed by vapor depositing a substance such as Al etc. on a base body made of high molecular film such as polyethylene etc. Laser light is irradiated locally on the surface of the foundation layer 2 using carbon dioxide gas laser etc. to cause sputtering, and concavities 3 are provided dispersedly. After providing concavities 3 on the foundation layer, a thin film 4 of ferromagnetic metal is formed on the surface of the foundation layer 2 by vapor depositing ferromagnetic metal such as Fe etc. by vacuum evaporation etc. As concavities 3 are provided on the foundation layer 2, the surface of the thin film 4 of ferromagnetic metal laminated on it becomes uneven. Accordingly, when it is run or rotated as a magnetic tape or a magnetic disk, friction between the surface of the thin film 4 of ferromagnetic metal and the magnetic head etc. is reduced and traveling efficiency of magnetic recording media is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic recording medium having an underlayer.

As a magnetic recording medium such as a magnetic tape, an IL film type is used, in which a ferromagnetic metal such as iron is attached to a substrate by vacuum evaporation, ion blating, sputtering, etc. to form a ferromagnetic metal S film. It's starting to look like this.

Incidentally, such thin-film magnetic recording media have the advantage of having a much higher recording density and being smaller in size than conventional coating-type magnetic recording media, but on the other hand, the ferromagnetic metal thin film surface is smooth. For this reason, they have the disadvantage of poor running performance and being easily damaged.

In order to improve these defects, 11! is applied to the surface of the ferromagnetic metal thin film. Although some devices are provided with an IWi layer, they have the drawback that sufficient effects cannot be obtained.

The present invention aims to improve the above-mentioned drawbacks and provide a method for manufacturing a magnetic recording medium with excellent running properties.

In order to achieve the above object, the present invention provides a method for manufacturing a magnetic recording medium in which a base layer is provided on a substrate and a ferromagnetic metal layer is formed on the surface of the base layer, in which a laser beam is applied to the surface of the base layer. The present invention provides a method for manufacturing a magnetic recording medium, which is characterized by locally irradiating and sputtering to form recesses on the surface.

Embodiments of the present invention will be described below based on the drawings.

First, as shown in FIG. 1, a substrate 1 made of a polymer film such as polyester or polyethylene is coated with AN, Or, S
i, Ta, Th, Ti, etc. are deposited to a thickness of 50~
A base 112 for about 400 people is formed.

Next, as shown in FIG. 2, the surface of the underlayer 2 is locally irradiated with a laser beam using a carbon dioxide laser or the like with a spot diameter of 1 μm to disperse the recesses 3 by sputtering. After providing the recess 3 in the base layer 2, as shown in FIG.
A ferromagnetic metal thin film 4 is formed on the surface of the base 112 by depositing a ferromagnetic metal such as F8, cobalt, or Ni using a vacuum evaporation method, an ion blasting method, a sputtering method, or the like.

That is, according to the present invention, since the recesses 3 are provided in the bases 1 and 2, the surface of the ferromagnetic metal thin film 4 laminated thereon becomes uneven. Therefore, when running or rotating as a magnetic tape or magnetic disk, ferromagnetic metal wi
Friction between the surface of the film 4 and magnetic heads, etc. is reduced, and the running properties of these magnetic recording media are improved.

In addition, since laser light is used to form the recesses 3 in the base layer, the position where the recesses 3 are to be formed can be determined accurately.
This has the advantage that the concave portions 3 can be prevented from being connected to each other, and that the rate of improvement in running performance can be determined in advance.

In the above embodiment, the ferromagnetic metal thin film 4 is exposed to the atmosphere, but as shown in FIG.
A slip layer 5 may also be formed.

As described above, according to the present invention, a method for manufacturing a magnetic recording medium with reduced friction and excellent running properties can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show the manufacturing process of the magnetic recording medium manufactured according to the present invention, with Figure 1 being a cross-sectional view of the underlayer with the underlayer formed, and Figure 2 being the cross-sectional view of the underlayer with recesses formed. 3 shows a cross-sectional view with a ferromagnetic gold layer formed thereon, and FIG. 4 shows a cross-sectional view with a lubricant layer formed. DESCRIPTION OF SYMBOLS 1... Base body, 2... Base layer, 3... Recessed part, 4
...Ferromagnetic metal thin film, 5...Lubricating layer.

Claims (1)

[Claims] (1) A method for manufacturing a magnetic recording medium in which an underlayer is provided on a substrate and a ferromagnetic metal thin film is formed on the surface of the underlayer,
1. A method for manufacturing a magnetic recording medium, which comprises locally irradiating the surface of an underlayer with a laser beam to cause sputtering, thereby forming recesses on the surface.