Soft magnetic powder, powder magnetic core, magnetic element, and electronic device
AssigneeSeiko Epson Corporation
InventorMayu Watanabe
Life of this patent
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Abstract
A soft magnetic powder including 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 73.0≤x≤79.5, respectively, and y is a number satisfying f(x)≤y≤0.99, in which f(x)=(4×10−34)x17.56], 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 deeper than 30 nm from a surface of the particle, and a maximum Cu concentration in the Cu segregated portion exceeds 6.0 at %.
Claims18
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.
Dependencies are inferred from the claim text.