Patent ID: 11961646
Assignee: SEIKO EPSON CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC H  B  C | IPC C  H

Claim 0:
1. A soft magnetic powder, comprising particles having a composition represented by FexCuaNbb(Si1-yBy)100-x-a-b 
provided that a, b, and x are each a number whose unit is at % and satisfy 0.3≤a≤2.0, 2.0≤b≤4.0, and 75.0≤x≤78.5, respectively, and y is a number satisfying f′(x)≤y≤0.97, in which f′(x)=(4×10−29)x14.93,
wherein the particle contains a crystal grain having a grain diameter of 1.0 nm or more and 30.0 nm or less, and includes a Cu segregated portion in which Cu is segregated,
the Cu segregated portion is present at a position 40 nm or more and 500 nm or less from a surface of the particle,
a maximum Cu concentration in the Cu segregated portion exceeds 6.0 at %, and
an Fe concentration, by at %, at a position 12 nm from the surface of the particle is higher than an O concentration, by at %, and a difference between the Fe concentration and the O concentration is 30 at % or more.