Acicular magnetic particles

Details Acicular magnetic particles Acicular magnetic particles

1986-11-18

1988-03-01

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Compositions

Loose particulate mixture containing metal particles

148312, 148315, B22F 100

Patent

active

047283637

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.

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"Cunife-I", Alloy Digest, Aug. 1961.

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