FLAT NANO-CRYSTAL SOFT MAGNETIC POWDER EXCELLENT IN NOISE INHIBITING EFFECT, AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To produce flat nano-crystal soft magnetic powder capable of obtaining an excellent noise inhibiting effect even in the case of the MHz zone or above, and to provide a production method therefor. ;SOLUTION: The flat nano-crystal soft magnetic powder excellent in a noise inhibiting effect is soft magnetic powder which has a composition composed essentially of Fe and also has a structure composed essentially of fine nano- crystal grains of ≤50 nm grain size, and the average grain size of the soft magnetic powder is 20 to 100 μm and the average thickness is ≤3 μm. This powder can be obtained by preparing, by a rapid solidification process, an amorphous alloy foil which has a composition, e.g. containing Fe as a primary component and also containing, as essential components, at least one element selected between Cu and Au and at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W, subjecting the foil to embrittlement treatment at a temperature not higher than the crystallization temperature and to crushing, and carrying out heat treatment at a temperature not lower than the crystallization temperature to form a structure composed essentially of fine nano-crystal grains of ≤50 nm grain size.;COPYRIGHT: (C)1999,JPO