Seiko Epson Corporation

Yasuko Kudo

Yu Maeda

Toshiki Akazawa

Mayu Watanabe

Hiroyoshi Otaka

A soft magnetic powder has a composition represented by FeCuSiBMM′XAlTi(at %) (wherein M is at least one element selected from the group consisting of Nb and the like, M′ is at least one element selected from the group consisting of V and the like, X is at least one element selected from the group consisting of C and the like, and a, b, c, d, e, f, g, and h satisfy the following formulae: 0.1≤a≤3, 0<b≤30, 0<c≤25, 5≤b+c≤30, 0.1≤d≤30, 0≤e≤10, 0≤f≤10, 0.002≤g≤0.032, and 0≤h≤0.038), wherein a crystalline structure having a particle diameter of 1 to 30 nm is contained in an amount of 40 vol % or more.

Soft magnetic powder, powder magnetic core, magnetic element, and electronic device

A soft magnetic powder of the invention has a composition represented by FeCuSiBMM'X(at %) [wherein M is Nb, W, Ta, Zr, Hf, Ti, or Mo, M&#x2032; is V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, or Re, X is C, P, Ge, Ga, Sb, In, Be, or As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1&#x2264;a&#x2264;3, 0&#x3c;b&#x2264;30, 0&#x3c;c&#x2264;25, 5&#x2264;b+c&#x2264;30, 0.1&#x2264;d&#x2264;30, 0&#x2264;e&#x2264;10, and 0&#x2264;f&#x2264;10], wherein a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less is contained in an amount of 40 vol % or more, and the difference in the coercive force of the powder after classification satisfies predetermined conditions.

A soft magnetic powder has a composition represented by FeCuSiBMM'X(at %) (wherein M is at least one element selected from the group consisting of Nb and the like, M&#x2032; is at least one element selected from the group consisting of V and the like, X is at least one element selected from the group consisting of C and the like, and 0.1&#x2264;a&#x2264;3, 0&#x3c;b&#x2264;30, 0&#x3c;c&#x2264;25, 5&#x2264;b+c&#x2264;30, 0.1&#x2264;d&#x2264;30, 0&#x2264;e&#x2264;10, and 0&#x2264;f&#x2264;10). The powder contains a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less in an amount of 40 vol % or more. When the apparent density is assumed to be 100, the tap density is 103 or more and 130 or less.

A soft magnetic powder has a composition represented by FeCuSiBMM'X(at %) (wherein M is Nb, W, Ta, Zr, Hf, Ti, or Mo, M&#x2032; is V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, or Re, X is C, P, Ge, Ga, Sb, In, Be, or As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1&#x2264;a&#x2264;3, 0&#x3c;b&#x2264;30, 0&#x3c;c&#x2264;25, 5&#x2264;b+c&#x2264;30, 0.1&#x2264;d&#x2264;30, 0&#x2264;e&#x2264;10, and 0&#x2264;f&#x2264;10), wherein a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less is contained in an amount of 40 vol % or more, and the Vickers hardness of the particles is 1000 or more and 3000 or less.

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Hachinohe, Japan

Yasuko Kudo