| 简介 |
PROBLEM TO BE SOLVED : To provide metal magnetic powder of low magnetic viscosity in which even fine particles exhibits orientation.
SOLUTION : The metal magnetic powder for magnetic recording composed of particles having a particle length of 10-45 nm, an axial ratio of 2 or more, and round distal end is obtained by a step of producing metal magnetic powder for magnetic recording by sequentially performing a step (elution step) of eluting nonmagnetic component in powder particles into liquid by making a reducing agent act on metal magnetic powder having metal magnetism phase principally comprising Fe or Fe and Co and containing at least one kind of rare earth element (Y is also treated as a rare earth element), Al and Si (hereinafter, referred to "nonmagnetic components") in a liquid containing a complexing agent which can form a complex with at least one kind of nonmagnetic component, a step (re-reduction step) for performing heat treatment in reducing gas atmosphere, and a step (stabilization step) of performing heat treatment in oxidizing gas atmosphere.
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