By means of XRD, TEM and XPS the magnetic properties of Fe
76Mo
3(SiB)
21amorphous alloys and the relations between the atomic distribution of various constituent elements and the behaviors of partial crystallization near the surface have been investigated. It was found that the high-frequency losses (P2/20k) of the amorphous core can be remarkably reduced by the proper selection of the technological parameters of oxidation treating, which is about 50% of the losses by a conventional annealing, ie.

/kg.