Soft magnetic alloy powder and production method therefor

Abstract

An Fe—Cr—Si-based soft magnetic alloy powder is provided in which the Cr weight ratio of Cr contained in the alloy powder gradually decreases from the surface of the alloy powder to a predetermined depth in the depth direction, the amount contained of Si is in the range of 3 to 6.5% by weight, the amount contained of Cr may be in the range of 1 to 5% by weight, at least one of Mn, P, S, and O may be further contained, the weight ratio of Cr oxide/metal Cr may gradually decrease from the surface of the alloy powder in the depth direction, and loss in the soft magnetic alloy powder used in a dust core is reduced so as to be able to cope with higher frequencies and larger currents.

Dependencies are inferred from the claim text.