Compositional Dependence of Curie Temperature and Magnetic Entropy Change in the Amorphous Tb-Co Ribbons

The Curie temperature (T-c) and magnetic entropy change (-Delta S-m), and their relationship to the alloy composition of Tb-Co metallic glasses, were studied systematically in this paper. It was found that, in contrast to the situation in amorphous Gd-Co ribbons, the dependence of Tc on Tb content and the maximum -Delta S-m vs. T-c -2/3 plots in Tb-Co binary amorphous alloys do not follow a linear relationship, both of which are supposed to be closely related to the non-linear compositional dependence of Tb-Co interaction due to the existence of orbital momentum in Tb.

Automated summary

The study systematically investigated the Curie temperature (Tc) and magnetic entropy change (-Delta S-m) of Tb-Co metallic glasses and their relationship to alloy composition. It was found that the non-linear compositional dependence of Tb-Co interaction due to the existence of orbital momentum in Tb may explain the non-linear relationship between Tc and Tb content, as well as the maximum -Delta S-m vs. Tc -2/3 plots in Tb-Co binary amorphous alloys.