Random anisotropy in UGe2 amorphous alloy

Magnetic properties have been observed for the UGe2 amorphous alloy produced by r.f. sputtering. No magnetization saturation at 50 kOe and large coercive force indicate that this alloy has marked random anisotropy. The isothermal remanence decays slowly in a manner of Arrhenius type thermal activation process. The thermomagnetic curves exhibit strong dependence on the history of cooling processes. The zero-field-cooled susceptibility χ0=M/H (H=10 Oe), indicates that the UGe2 amorphous alloy undergoes a higher-order phase transition to a spin-glass like phase with no spontaneous magnetization but an infinite susceptibility, as proposed by Aharony and Pytte. (orig.)