Patent ID: 8083867

Claim:
An amorphous alloy ribbon, wherein the alloy composition is represented by Fe 100-a-b-c-d M a Si b B c C d (atomic %), 0<a ≦10, 8≦b ≦17, 5≦c≦10, 0.01<d≦0.05, 9≦a+b+c+d≦35, wherein greater than or equal to 0.5 atomic % and less than or equal to 2 atomic % of Fe is substituted by at least one element selected from Cu and Au, and an amorphous alloy ribbon consists of inevitable impurities, said M is at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W, and C concentration takes a maximum value, by glow discharge luminescence surface analysis, at a 2-20 nm SiO 2 equivalent depth from the surface of said amorphous alloy ribbon.