Patent ID: 7132019

Claim:
An amorphous soft magnetic alloy powder, which is produced by a water atomization method in which liquid droplets of a molten alloy are jetted so as to bring into contact with water and are quenched, wherein the powder comprises Fe as a major component, contains at least P, C, B, and Si, comprises an amorphous phase having a temperature interval ΔTx of a supercooled liquid as represented by ΔTx=Tx−Tg (wherein Tx is a crystallization initiation temperature and Tg is a glass transition temperature, respectively) of 20K or more, has a hardness Hv of 1000 or less, is provided with a layer with a high concentration of Si at a surface portion thereof, and is represented by the following composition formula: Fe 100−a−b−x−y−z−w−t Co a Ni b M x P y C z B w Si t wherein M is one or two or more elements selected from Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pt, Pd, and Au, with a, b, x, y, z, w and t representing composition ratios in a range of 0≦x≦3, 2≦y≦15, 0≦z≦8, 1≦w≦12, 0.5≦t≦8, 0≦a≦20, 0≦b≦5 and 70≦(100−a−b−x−y−z−w−t)≦80 in atomic %, respectively.