The magnetic susceptibility of hydrogen-doped partially crystalline (Zr 76Ni 24) 1−xH x metallic glasses

Abstract

The magnetizations of Zr 76Ni 24 metallic glass and hydrogen-doped partially crystalline (Zr 76Ni 24) 1− x H x metallic glasses have been measured in the temperature range 10–300 K and magnetic fields up to 2 T for various dopant concentrations ( x=0, 0.024, 0.043, 0.054). It is found that the samples are paramagnetic and magnetic susceptibility at room temperature, χ(300 K), shows a nonmonotonic behaviour upon hydrogenation. The values of χ(300 K) of the hydrogen-doped partially crystalline (Zr 76Ni 24) 1− x H x metallic glasses are reduced with increase in hydrogen content up to x=0.043, whereas for x=0.054, an enhancement of χ(300 K) has been revealed. The magnetic susceptibility is weakly temperature dependent down to 110 K, below which an increase is observed. A shallow minimum exists between 90 and 120 K. The form and magnitude of the observed temperature dependence of the magnetic susceptibility are well accounted for by the sum of the quantum corrections to the magnetic susceptibility. Hydrogen reduces the electronic diffusion constant and influences strongly the quantum interference at defects, slowing down the spin diffusion and enhancing the magnetic susceptibility in the temperature range from 110 down to 10 K.