Method of producing ferromagnetic particles

Details Method of producing ferromagnetic particles Method of producing ferromagnetic particles

1985-12-02

1987-04-14

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, C22C 104

Patent

active

046575839

ABSTRACT:
The present invention relates to a method for producing magnetic particles for use in recording media. The method comprises providing an alloy capable of forming a magnetic precipitate, aging the alloy to form a magnetic precipitate comprising a plurality of magnetic particles dispersed throughout a surrounding matrix; and dissolving the matrix to leave the magnetic particles. Magnetic particles produced by the present method are characterized by a size in the range of about 100 .ANG. to about 2000 .ANG., a single magnetic domain, an aspect ratio up to about 10:1, a relatively smooth surface, and a substantially uniform composition throughout.

REFERENCES:
patent: 1628190 (1927-08-01), Raney
patent: 4093477 (1978-06-01), Iwata et al.
patent: 4257830 (1981-03-01), Tsuya et al.
patent: 4274865 (1981-06-01), Suzuki et al.
patent: 4290799 (1981-09-01), Schroeder et al.
patent: 4461685 (1984-07-01), Pryor
"Spinodal Structures", by Karl B. Rundman, Metals Handbook, vol. 8, 1973, pp. 184-185.
"Cunife-I", Alloy Digest, Aug. 1961.

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