| 摘要 |
A magnetic core made of an Fe-base soft magnetic alloy consisting essentially of Fe, cpu and M wherein M is at least one element selected from the group consisting of nab, W, Ata, Zr, Hf, Ti and mao, at least 50% of the alloy structure being occupied by fine crystalline particles, and a change ratio X of effective permeability with time of said magnetic core being 0.3 or less, where X is defined by the following formula: X = 1 - .mu. b / .mu. a wherein .mu. a is effective permeability at 1 kHz, and .mu. b is effective permeability at 1 kHz after heating at 100 .degree.C for 1000 hours in the air.
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