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.