Critical behavior in alloys with random magnetic anisotropy

We have studied the critical behavior in amorphous Tb65Co35. Scaling analyses were done over a number of reduced temperature (t=‖T−Tc‖/Tc) ranges to ascertain that the critical regime had been reached. The magnetization follows linear (ferromagnetic) scaling at high fields (1–55 kOe) and nonlinear (spin-glass) scaling at low fields (<1 kOe). The critical exponents for ferromagnetic scaling and for spin-glass scaling are not a function of reduced temperature range.