Method for making smooth-surfaced magnetic recording medium

Details Method for making smooth-surfaced magnetic recording medium Method for making smooth-surfaced magnetic recording medium

1989-09-18

1991-08-06

Nguyen, Nam X.

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

2041922, C23C 1434

Patent

active

050375156

ABSTRACT:
A high-density thin-film magnetic disc and method of producing the disc. In forming the disc, chromium is sputtered onto a smooth-surfaced, non-metallic substrate, such as a glass substrate, first at room temperature, to form a substratum with a random structure, then at a high temperature, to form a chromium underlayer with anisotropic crystal orientation. A cobalt-based alloy is sputtered onto the underlayer to form the thin film magnetic layer. The disc has high coercivity, low bit shift, and can be operated at a flying height of between 2-4 .mu.inches.

REFERENCES:
patent: 4245008 (1981-01-01), Michaelsen et al.
patent: 4426265 (1984-01-01), Brunsch et al.
patent: 4552820 (1985-11-01), Lin et al.
patent: 4576700 (1986-03-01), Kadokura et al.
patent: 4604179 (1986-08-01), Eltoukhy et al.

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