HIGH-FIELD MAGNETIZATION BEHAVIOR IN RANDOM ANISOTROPY AMORPHOUS CO-ER ALLOYS

Amorphous Co1-xErx ribbons with x=55 and 65 were prepared by the melt-spinning technique. Magnetization measurements were carried out in the temperature range 4-100 K under high magnetic fields up to 20 T. Even at 20 T the saturation is not fully attained. Assuming that Co has no moment in the alloy with x=65 the Er moment is found to be 7.0 mu(B) which indicates a speromagnetic spin structure. The Co moment in the alloy with x = 55 is then found to be 0.1 mu(B), which is negligibly small. By analyzing the approach to saturation using Chudnovsky's theory we have extracted some fundamental parameters.