Iron oxide magnetic film and process for fabrication thereof

Details Iron oxide magnetic film and process for fabrication thereof Iron oxide magnetic film and process for fabrication thereof

1983-09-16

1985-10-01

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of inorganic material

428702, 428900, 252 6256, B32B 1518

Patent

active

045446121

ABSTRACT:
.gamma.-Fe.sub.2 O.sub.3 film with at least one additive selected from the group consisting of Pd, Au, Pt, Rh, Ag, Ru, Ir, and Os, especially Os are disclosed. Reduction from .alpha.-Fe.sub.2 O.sub.3 to Fe.sub.3 O.sub.4 is accelerated by additive Os to achieve a uniform reduction and increase the ratio of magnetic phase in the film. .gamma.-Fe.sub.2 O.sub.3 film medium with Os improved saturation magnetization and increased coercive force in proportion to amount of additive Os. Application of an external field to said film introduces magnetic anisotropy into said film, therefore said film medium improves coercive force and squareness of hysteresis loop by the introduction of anisotropy. .gamma.-Fe.sub.2 O.sub.3 crystal grain is prepared by additive Os to obtain fine grain. The resultant .gamma.-Fe.sub.2 O.sub.3 film medium a decreased noise level.

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