Cobalt modified magnetic iron oxide

Details Cobalt modified magnetic iron oxide Cobalt modified magnetic iron oxide

1979-07-02

1981-06-30

Cooper, Jack

Stock material or miscellaneous articles

Composite

Of polyester

427128, 428900, 428694, 252 6256, C01G 4902

Patent

active

042761832

ABSTRACT:
Magnetic material comprising magnetic iron oxide modified with at least about 0.5 weight % cobalt, based on the weight of total product which when combined with a binder at a 75% by weight loading forms a magnetic recording member having an orientation ratio and coercivity value that corresponds to a coordinate value equal to or above the coordinate values on the FIGURE and an M-factor value between about -1.0 and +1.0. The magnetic material is preferred in which the amount of cobalt present is from about 0.5 to about 5.0 weight % based on the weight of total product and in which chromium is also present in an amount of from about 0.1 to about 0.3 weight percent based on the weight of total product. A magnetic impulse record member having such a magnetic material dispersed in a binding medium is also claimed.

REFERENCES:
patent: 3725126 (1973-04-01), Haller et al.
patent: 3748270 (1973-07-01), Hwang
patent: 4071610 (1978-01-01), Koester et al.

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