Magnetism in amorphous transition metals. II.

Abstract

Susceptibilities and pressure effects on the magnetic properties of amorphous transition metals have been investigated on the basis of a finite-temperature theory of local-environment effects in amorphous metallic magnetism. Calculated high-field susceptibilities, paramagnetic susceptibilities, effective Bohr-magneton numbers, and the pressure dependence of magnetization, Curie temperature, and spin-glass temperatures are shown to explain various aspects of the magnetism in amorphous and liquid transition metals and alloys as a function of the d electron number. It is demonstrated that these quantities are governed by the electronic structure of amorphous transition metals, in particular, by the main-peak position in the noninteracting density of states for amorphous structure. Moreover, the detailed investigations for susceptibilities, forced-volume magnetostriction, and the T-P phase diagram in the reentrant spin-glass region reveal that the itinerant-electron spin glasses in the Fe-rich amorphous alloys with more than 90 at. % Fe are caused by structural disorder instead of configurational disorder.