Random Anisotropy Studies in Amorphous Fe80—y—xNiyMnxB12Si8 Alloys

Abstract

We have studied the magnetization of melt‐spun amorphous Fe80—y—xNiyMnxB12Si8 alloys with 20 ≤ y(Ni) ≤ 50 and 0 ≤ x(Mn) ≤ 2 under magnetic fields up to 18 kOe, and have analyzed the results at 4.2 K, based on the random magnetic anisotropy (RMA) model. The approach to saturation is established in the form of H—1/2 for the various samples. The exchange constant A and the ferromagnetic correlation length Rf decrease with Mn addition while the local random anisotropy is enhanced.