US 12,080,457 B2
Soft magnetic metal alloy and electronic component
Hironobu Kumaoka, Tokyo (JP); Akito Hasegawa, Tokyo (JP); Kazuhiro Yoshidome, Tokyo (JP); and Hiroyuki Matsumoto, Tokyo (JP)
Assigned to TDK Corporation, Tokyo (JP)
Filed by TDK Corporation, Tokyo (JP)
Filed on Sep. 22, 2020, as Appl. No. 17/028,234.
Claims priority of application No. 2019-177411 (JP), filed on Sep. 27, 2019; and application No. 2020-131575 (JP), filed on Aug. 3, 2020.
Prior Publication US 2021/0098162 A1, Apr. 1, 2021
Int. Cl. H01F 1/153 (2006.01); H01F 1/20 (2006.01)
CPC H01F 1/15308 (2013.01) [H01F 1/15325 (2013.01); H01F 1/15333 (2013.01); H01F 1/20 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A soft magnetic alloy including:
a Fe-based nanocrystal,
wherein the soft magnetic alloy further includes metallic glass,
a differential scanning calorimetry curve of the soft magnetic alloy has a glass transition point Tg,
a temperature rising rate of the soft magnetic alloy in measurement of the differential scanning calorimetry curve is 40 K/minute,
a temperature Tp of a maximum exothermic peak in the differential scanning calorimetry curve is higher than the Tg,
the soft magnetic alloy is expressed by the following Chemical Formula 1,
(Fe1-α-βX1αX2β)1-hMaBbPcSid  (1)
provided that, h is a+b+c+d,
X1 is at least one element selected from the group consisting of Co and Ni,
X2 is at least one element selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cr, Bi, N, O, S, and a rare earth element,
M is at least one element selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W, and V,
a is from 0.0 to 0.15,
b is from 0.0 to 0.20,
c is from 0.0 to 0.20,
d is from 0.0 to 0.20,
α is 0 or more,
β is 0 or more,
α+β is from 0 to 0.50,
1-h is more than 0.65 and 0.9 or less, and
a unit of each of α, β, a, b, c, d, and h in the Chemical Formula 1 is mole ratio.