EXCHANGE SPRING MAGNETIC POWDER

摘要

PROBLEM TO BE SOLVED: To provide exchange-spring magnetic powder capable of improving saturation magnetization without causing the lowering of a coercive force even if a volume ratio of a soft magnetic phase with respect to a hard magnetic phase is increased.

SOLUTION: Each particle size of the hard magnetic phase and the soft magnetic phase is made to be larger than a super-paramagnetic critical diameter and equal to or smaller than a single domain critical diameter. A particle itself is constituted to be a nano-size single-crystal particle. Thus, saturation magnetization can be improved without causing the lowering of the coercive force even if the volume ratio of the soft magnetic phase with respect to the hard magnetic phase is increased.

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