Patent ID: 7357844

Claim:
A soft magnetic Fe—B—Si-based metallic glass alloy product comprising metallic glass alloy being represented by the following composition formula: (Fe 1-a-b B a Si b ) 100-χ M χ, wherein a and b represent an atomic ratio, and satisfy the following relations: 0.125≦a≦0.17, 0.10≦b≦0.15 and 0.225≦a+b≦0.3 M is one or more elements selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti, V, Cr. Pd and W, and χ satisfies the following relation: 1 atomic %≦χ≦10 atomic %. wherein said metallic glass alloy has a supercooled-liquid temperature interval (ΔT χ ) of 40 K or more, a reduced glass-transition temperature (T g /T m ) of 0.56 or more, said glass alloy product as cast has minimum thickness or diameter of 0.5 mm or more, and a volume fraction (Vf-amo) of a glass phase is 100%, and a saturation magnetization of more than 1.4 T and coercive force of 3.7A/m or less.