Treatment of ferromagnetic metal powders and magnetic recording media using the same
First Claim
1. A method for treating a ferromagnetic metal powder which comprises forming ferromagnetic metal powder, and then exposing said ferromagnetic metal powder to a low temperature plasma in an oxygen atmosphere.
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Accused Products
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.
17 Citations
7 Claims
- 1. A method for treating a ferromagnetic metal powder which comprises forming ferromagnetic metal powder, and then exposing said ferromagnetic metal powder to a low temperature plasma in an oxygen atmosphere.
Specification