Magnetic susceptibility of (Zr 80Fe 20) 1− xH x metallic glasses

Abstract

The magnetisation of hydrogen-doped (Zr 80Fe 20) 1− x H x metallic glasses has been measured in the temperature range 1.7–100 K for various dopant concentrations. The system is paramagnetic with magnetic susceptibilities that are only weakly temperature dependent down to about 25 K and hydrogen concentration x<0.03. For a larger hydrogen concentration, x=0.1, the magnetic susceptibility becomes strongly temperature dependent and shows the Curie–Weiss behaviour. It has been also found that the magnetic susceptibility at 100 K, χ(100 K), decreases for hydrogen concentration x=0.03, while for x=0.1 it increases again. This behaviour is primarily due to the increased contribution of the Fe 3d-electronic states to the density of states at the Fermi level and to the formation of spin fluctuations and magnetic moments on the Fe sites at hydrogen concentrations x>0.03. The form and magnitude of the observed temperature dependence of the magnetic susceptibility are well accounted for by the sum of the Curie–Weiss term and the quantum corrections to the susceptibility.