Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1994-05-27

1997-09-02

Kiliman, Leszek

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428336, 428408, 428694T, 428694TP, 428694TC, 428694TR, 428900, G11B 566, B32B 310, B32B 900, B32B 516

Patent

active

056629842

ABSTRACT:
A magnetic recording medium has a magnetic layer formed by a thin magnetic metal layer and a carbon protective layer on a non-magnetic substrate; the surface of the carbon protective layer has first protrusions formed by first particles and second protrusions formed by second particles; the carbon protective film has a thickness in the range of 3 nm to 30 nm, while the first protrusions have the heights of 65 nm.+-.15 nm to 95 nm.+-.15 nm and the second protrusions have the heights of 18 nm.+-.5 nm to 28 nm.+-.5 nm; since the surface properties of the carbon protective film are controlled, the electro-magnetic conversion characteristics may be prevented from being lowered due to the spacing losses for improving the running durability of the recording medium.

REFERENCES:
patent: 4505966 (1985-03-01), Adachi
patent: 4540618 (1985-09-01), Suzuki
patent: 4639389 (1987-01-01), Nishimatsu
patent: 4645703 (1987-02-01), Suzuki
patent: 4762742 (1988-08-01), Sonoda
patent: 4778707 (1988-10-01), Arioka
patent: 4835032 (1989-05-01), Arioka
patent: 4837116 (1989-06-01), Arioka
patent: 5047278 (1991-09-01), Ono
patent: 5082714 (1992-01-01), Yanai
Japanese Patent Abstract JP-A-01-176-313.
Japanese Patent Abstract JP-A-01-176-314.
Japanese Patent Abstract JP-A-01-176-311.

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