Process for producing a magnetic recording medium

Details Process for producing a magnetic recording medium Process for producing a magnetic recording medium

1977-03-03

1979-05-22

Cooper, Jack

Coating processes

Magnetic base or coating

Magnetic coating

427132, 252 6255, 252 6256, 252 626, G11B 584, C04B 3526, C01G 4908

Patent

active

041560370

ABSTRACT:
A thin film of ferrite for use as a magnetic recording medium contain (a) Cu, (b) both Cu and Co, or (c) Cu, Co and Nb. The inclusion of Cu increases the temperature range for reduction from .alpha.-Fe.sub.2 O.sub.3 to one of the ferrites, i.e. Fe.sub.3 O.sub.4, and also lowers the above-mentioned reducting temperature. The addition of Co improves the magnetic properties of the ferrite. The simultaneous addition of Cu, Co and Nb provides .gamma.-Fe.sub.2 O.sub.3 with excellent magnetic properties, which are stable over wide temperature range for oxidizing the Fe.sub.3 O.sub.4 to the .gamma.-Fe.sub.2 O.sub.3.

REFERENCES:
patent: 3075919 (1963-01-01), Gruber et al.
patent: 3795542 (1974-03-01), Halaby et al.
patent: 3903004 (1975-09-01), Matsumoto et al.
patent: 3912646 (1975-10-01), Leitner et al.
patent: 4032674 (1977-06-01), Hirabayashi et al.

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