Magnetic recording medium and process for producing the same

Details Magnetic recording medium and process for producing the same Magnetic recording medium and process for producing the same

1977-03-02

1980-07-29

Silverman, Stanley S.

Coating processes

Magnetic base or coating

Magnetic coating

204192R, 204192C, 204192M, 252 6256, 252 6257, 252 6258, 252 6259, 252 626, 4272554, 428900, H01F 110

Patent

active

042151589

ABSTRACT:
A thin film of ferrite for use as a magnetic recording medium includes up to ten atomic percent of Nb based on the total number of metallic atoms in the ferrite film. This thin film of ferrite further includes up to fifteen atomic percent of Cu in addition to the Nb. The inclusion of Nb improves the squareness ratio and the coercive force of the recording medium, and also enlarges the temperature range of reduction from .alpha. -Fe.sub.2 O.sub.3 to one of the ferrites, i.e. Fe.sub.3 O.sub.4. The inclusion of Cu lowers the reduction temperature below 300.degree. C. According to the invention, a magnetic recording medium exhibiting excellent required properties, such as a high coercive force and a high squareness ratio, can be produced by a reliable process.

REFERENCES:
patent: 3414372 (1968-12-01), Panlers et al.
patent: 3995093 (1976-11-01), Heinz
patent: 3996095 (1976-12-01), Ahor et al.
patent: 4003813 (1977-01-01), Hattori et al.
patent: 4013534 (1977-03-01), Ishii

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