Estimation of the Local Magnetic Anisotropy Energy of Amorphous Rare Earth Based Alloys

Studies to determine the local anisotropic energy D of rare earth atoms in amorphous TbFe, TbAg, and DyFe alloys through comparisons of experimental and calculated values for the Arrott plot coefficient at the Curie temperature were studied. Iterative calculations converging on a solution for the magnetization were used in determining the theoretical value of b for different local an isotropy energies D; this method was used to find the D for which the experimental and calculated values of b coincided. Values of D thus obtained ranged from 1.1 to 9.6 (× 10¹⁵ erg/atom).