Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1982-10-12

1985-11-19

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

428212, 428900, G11B 2300, B32B 702

Patent

active

045546061

ABSTRACT:
A magnetic recording medium having two magnetic layers, which comprises an upper magnetic layer and a lower magnetic layer, said lower magnetic layer having a coercive force of at least 100 oersteds, preferably 100 to 500 oersteds, lower than that of the upper magnetic layer, the thickness of the upper and lower magnetic layers being in the ratio of the thickness of the upper magnetic layer to that of the lower magnetic layer of 1/1 to 1/9, and the total coercive force of the upper and lower magnetic layers being 1,000 oersteds or more. The magnetic recording medium has excellent sensitivity and frequency characteristics at low and high frequency bands with less noise.

REFERENCES:
patent: 4075384 (1978-02-01), Suzuki et al.
patent: 4210946 (1980-07-01), Iwasaki et al.
patent: 4423453 (1983-12-01), Kawahara et al.

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