Platelike magnetic powder and a recording medium which uses the

Details Platelike magnetic powder and a recording medium which uses the Platelike magnetic powder and a recording medium which uses the

1988-05-09

1989-12-12

Cooper, Jack

Stock material or miscellaneous articles

Composite

Of inorganic material

252 6258, 252 6259, 252 626, 252 6262, 252 6263, C04B 3526

Patent

active

048867144

ABSTRACT:
The present invention provides a platelike magnetic powder made from a magnetic powder having particles each of which has a portion comprising the spinel type crystal structure and a portion comprising the magnetoplumbite type crystal structure. The magnetic powder provides a large saturation magnetization .sigma.s and a small temperature change .DELTA.Hc/.DELTA.T of coercive force in the vicinity of the room temperature. Further, the present invention is to provide a high density magnetic recording medium which uses the magnetic powder. Furthermore, the present invention is to provide, a method to easily manufacture the magnetic powder by the coprecipitation method. A raw material powder of superfine particles is prepared. The prepared powder is fired at a low temperature in a non-oxidizing atmosphere.

REFERENCES:
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Kiyama et al., "Advances in Ceramics", vol. 15, Fourth Int. Conf. on Ferrites, Part I, (The American Ceramics Society), p. 51 (1986).
Kubo et al., "IEEE Transactions on Magnetics", vol. MAG-18, p. 1122 (1982).
H. Kojima, "Ferromagnetic Materials", ed. E. P. Wohlforth, pp. 318-323 (North-Holland Pub. Co., Amsterdam, 1982).
Haneda et al., "Journal of the American Ceramic Society", vol. 57, No. 8, pp. 354-357 (1974).
Fuchikami, "J. Phys. Soc. Japan", vol. 20(5) pp. 760-769 (1985).

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