Treatment of ferromagnetic metal powders and magnetic recording

Details Treatment of ferromagnetic metal powders and magnetic recording Treatment of ferromagnetic metal powders and magnetic recording

1990-10-02

1991-11-05

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148286, 148287, 21912159, H01F 102

Patent

active

050629042

ABSTRACT:
Disclosed are (1) methods for treating ferromagnetic metal powders which comprise synthesizing the ferromagnetic metal powders, and then exposing the ferromagnetic metal powders to plasma in an oxygen atmosphere, and (2) magnetic recording media comprising non-magnetic supports and magnetic layers formed thereon, the magnetic layers being mainly composed of ferromagnetic metal powders and binder resins, in which the ferromagnetic metal powders are treated by the methods described in (1). The ferromagnetic metal powders obtained by the above methods are excellent in oxidation stability, and the magnetic recording media using the above ferromagnetic metal powders are excellent in storage stability.

REFERENCES:
patent: 4318735 (1982-03-01), Mishima et al.
patent: 4420330 (1983-12-01), Jakusch et al.
patent: 4608093 (1986-08-01), Umemura et al.
patent: 4909865 (1990-03-01), Nakagawa et al.

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