Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1978-09-19

1980-07-01

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

428900, 428212, 427131, G11B 566

Patent

active

042109469

ABSTRACT:
A magnetic recording medium suitable for use in a recording system employing a magnetic recording transducer or head of the single-pole type which operates in a perpendicular magnetization mode comprises a non-magnetic base supporting a layer of low coercive force material formed on the base and which underlies a magnetic recording layer. The magnetic recording layer which faces the magnetic recording transducer or head is formed of an alloy composed mainly of chromium and cobalt and has an easy axis of magnetization perpendicular to the surface of the magnetic recording layer, with the thickness of the latter being no greater than 3.0 microns. The low coercive force material layer has a coercive force no greater than 1/5 of the coercive force of the magnetic recording layer, and the thickness of the low coercive force layer is greater than 0.1 microns.

REFERENCES:
patent: 3052567 (1962-09-01), Gabor et al.
patent: 3116159 (1963-12-01), Fisher et al.
patent: 3185775 (1965-05-01), Camras
patent: 3328195 (1967-06-01), May
patent: 4024489 (1977-05-01), Bajorek et al.
patent: 4075384 (1978-02-01), Suzuki et al.
patent: 4075672 (1978-02-01), Manly
patent: 4079169 (1978-03-01), Nigh et al.

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