Perpendicular magnetic recording medium

Details Perpendicular magnetic recording medium Perpendicular magnetic recording medium

1984-12-24

1988-02-16

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

2041922, 20419222, 20419223, 427131, 427132, 428216, 428336, 428694, 428695, 428900, 428 69B, 428699, 428701, 428472, G11B 572

Patent

active

047254823

ABSTRACT:
A Co-Cr perpendicular magnetic recording medium includes a chromium oxide film formed on a Co-Cr perpendicular magnetization film, and a SiO.sub.2 protective film formed on the chromium oxide film. The chromium oxide film is formed by conducting a heating treatment to the surface of the Co-Cr perpendicular magnetization film in an oxygen atmosphere of about 10.sup.-4 to 10.sup.-3 Torr, at a temperature of about 300.degree. C. to 400.degree. C. for about two hours. The chromium oxide film has a thickness of about 20 to 200 .ANG.. The SiO.sub.2 protective film has a thickness greater than 50 .ANG., but the total thickness of the chromium oxide film and the SiO.sub.2 protective film is selected between 70 and 300 .ANG..

REFERENCES:
patent: 3498837 (1970-03-01), Alstad
patent: 4268369 (1981-05-01), Barlow
patent: 4272563 (1981-06-01), Steck
patent: 4307156 (1981-12-01), Yangisawa
patent: 4390562 (1983-06-01), Yanagisawa
patent: 4454195 (1984-06-01), Fukuda
patent: 4495242 (1985-01-01), Arai
patent: 4537832 (1985-08-01), Kohmoto
patent: 4565734 (1986-01-01), Arai
patent: 4581245 (1986-04-01), Nakamura
patent: 4675240 (1987-06-01), Weiss
Journal of Magnetism and Magnetic Materials 35, (1983) 286-288.

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