Concentration and temperature dependence of the Hall resistivity in FeZr glasses

Abstract

Hall resistivity measurements are reported for amorphous FexZr1−x alloys near the critical concentration, xc =0.37, for the onset of ferromagnetism. At room temperature, the Hall coefficient RH is positive and grows systematically with Fe concentration as xc is approached from the paramagnetic side. The temperature dependence of RH follows a Curie-like variation whose coefficient diverges at xc. In the ferromagnetic regime, the spontaneous Hall coefficient is extremely large, leading to the conclusion that the side-jump mechanism is responsible for the magnetic contribution. Furthermore, the dependence of RH on susceptibility in the two regimes suggests that this same side-jump term is also responsible for the positive Hall coefficient in the nonmagnetic glasses.