CPC H01F 1/22 (2013.01) [H01F 1/12 (2013.01); H01F 1/14 (2013.01); H01F 1/147 (2013.01); H01F 1/14733 (2013.01); H01F 1/15308 (2013.01); H01F 1/15333 (2013.01); H01F 3/08 (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
75.5≤x≤79.5, 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 2.0 nm or more and 10.0 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 2.0 nm or more and 7.0 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,
a number proportion of the second Cu segregation portion in the Cu segregation portion positioned in the inner portion is 80% or more, and
the number of the second Cu segregation portion is twice or more the number of the first Cu segregation portion.
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