A. Inoue et al., High-frequency permeability characteristics of Fe- and Co-based amorphous alloys with high B concentrations, IEEE MAGNET, 35(5), 1999, pp. 3355-3357
New Fe-based and Go-based amorphous alloys with a high B concentration of 3
0at% were formed in (Fe,Co,Ni)(62)Nb8B30 system. The amorphous alloys exhib
it a wide supercooled liquid region (Delta T-x) above 80K before crystalliz
ation in the range of 5 to 40%Co and 0 to 10%Ni and the largest Delta T-x i
s 87K for Fe52Co10Nb8B30. The Fe62-xCoxNb8B30 alloys exhibit good soft magn
etic properties i.e., low coercive force (H-c) of 2-3 Am high effective per
meability (mu(c)) of 20000-30000 at 1kHz and low saturated magnetostriction
(lambda(s)) of 2-8 x 10(-6), The high Il characteristics are maintained in
a higher frequency range and the highest mu(e) at 1kHz is 7500 for Co40Fe2
2Nb8B30 with a high resistivity of 237 mu Omega cm. The finding of the (Fe,
Co)(62)Nb8B30 amorphous alloys exhibiting large Delta T-x, good high-freque
ncy permeability and high resistivity is encouraging the future development
as a new soft magnetic materials.