A complete study of the magnetic phase diagram and magnetic anisotropy of pseudoternary (ErxDy1-x)2Fe14B compounds has been carried out by the use of low-field ac magnetic susceptibility, magnetization, and singular-point detection measurements on magnetically aligned samples. A cone magnetic structure has been observed in compounds with 0.6≤x<0.9, even at low temperatures, and the thermal dependence of the cone angle for each concentration has been determined. Substitution of Er by Dy gives rise to a significant modification of the magnitude and temperature dependence of the anisotropy field HA’ (i.e., the field on the basal plane), a linear dependence being observed with Dy concentration at 293 K. The present data have been interpreted in terms of a crystalline-electric-field–mean-field model. The inclusion of only second- and fourth-order crystal-field terms is enough to account for the phase diagram and the cone magnetic structure. The fourth-order terms should necessarily be included into the Hamiltonian in order to account for the variation of angle of the cone magnetic structure, both with temperature and concentration.
Magnetic Phase Diagram and Anisotropy of Pseudo-Ternary (Er1-xDyx)2Fe14B Compounds / M.R. Ibarra; P.A. Algarabel; C. Marquina; J.I. Arnaudas; A. del Moral; L. Pareti; O. Moze; G. Marusi; M. Solzi. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 39:10(1989), pp. 7081-7088. [10.1103/PhysRevB.39.7081]
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