Magnetic recording medium and magnetic disk device

Details Magnetic recording medium and magnetic disk device Magnetic recording medium and magnetic disk device

1997-08-08

1999-08-31

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 657, 428336, 428694T, 428694TS, 428900, 360113, 324252, G11B 566

Patent

active

059451904

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic substrate; and, provided on the nonmagnetic substrate in the following order: an underlayer comprising chromium as a major component and molybdenum as a minor component; and a recording layer comprising 56 to 78 at % of cobalt, 14 to 22 at % of chromium, 4 to 20 at % of platinum, and a sum of 0.5 to 4 at % of tantalum and niobium, the recording layer having a tBr (a product of the thickness t and the residual magnetization density Br of the recording layer) of 40 to 200 G..mu.m. A longitudinal magnetic recording medium is provided which has high coercive force, contributing to a high reproduction output, and, at the same time, a low noise level.

REFERENCES:
patent: 4929514 (1990-05-01), Natarajan et al.
patent: 5004652 (1991-04-01), Lal
patent: 5024903 (1991-06-01), Mizukami
patent: 5049451 (1991-09-01), Lal
patent: 5057200 (1991-10-01), Lal

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