CPC C22C 38/02 (2013.01) [B22F 1/08 (2022.01); B22F 5/106 (2013.01); C22C 38/002 (2013.01); C22C 38/12 (2013.01); C22C 38/16 (2013.01); H01F 1/20 (2013.01); H01F 27/255 (2013.01); B22F 1/103 (2022.01); B22F 1/142 (2022.01); B22F 3/02 (2013.01); B22F 9/04 (2013.01); B22F 9/082 (2013.01); B22F 2301/35 (2013.01); B22F 2304/10 (2013.01); B22F 2999/00 (2013.01); C22C 2202/02 (2013.01)] | 9 Claims |
1. A soft magnetic powder comprising:
a particle having a composition represented by FexCuaNbb(Si1-yBy)100-x-a-b,
a, b, and x being numbers whose units are atomic %, in which
0.3≤a≤2.0,
2.0≤b≤4.0, and
72.5≤x<75.5, and
y being a number satisfying f(x)≤y≤0.99, and f(x)=(4×10−34)x17.56, wherein
the particle includes
a crystal grain having a grain size of 1.0 nm or more and 30.0 nm or less and containing a Fe—Si crystal,
a Cu segregation portion in which Cu is segregated, and
a crystal grain boundary,
a content proportion of the crystal grain in the particle is 30% or more, and
when the Cu segregation portion positioned in a surface layer portion of the particle and having a grain size of 1.0 nm or more and 5.0 nm or less is referred to as a first Cu segregation portion, and the Cu segregation portion positioned in an inner portion of the particle and having a grain size of 3.0 nm or more and 10.0 nm or less is referred to as a second Cu segregation portion,
a number proportion of the first Cu segregation portion in the Cu segregation portion positioned in the surface layer portion is 80% or more, and
a number proportion of the second Cu segregation portion in the Cu segregation portion positioned in the inner portion is 80% or more.
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