Magnetic recording medium and magnetic recording method for digi

Details Magnetic recording medium and magnetic recording method for digi Magnetic recording medium and magnetic recording method for digi

1992-06-22

1995-03-28

Thibodeau, Paul J.

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4284735, 428694T, 428684TC, 428684ST, 428684SL, B32B 516, B32B 2700, G11B 566

Patent

active

054015723

ABSTRACT:
The coefficient k.sub.1 of linear expansion in a temperature range from 50.degree. to 300.degree. C. of a non-magnetic support member of a recording medium, before a Co-Cr alloy film is formed thereon, is less than 0 mm/mm .degree.C., and the coefficient k.sub.2 of linear expansion in a temperature range from 50.degree. to 300.degree. C. of that support member after the Co-Cr alloy film is formed is less than 0.3.times.10.sup.-5 mm/mm .degree.C. The alloy film also includes carbon in the magnetic layer, and a protective film comprised of carbon is further formed on the magnetic layer. The recording medium is particularly adapted for perpendicular magnetic recording.

REFERENCES:
patent: 4557982 (1985-12-01), Nouda et al.
patent: 4886874 (1989-12-01), Nagano

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