Crystallization Behavior and Curie Temperature for Melt-Spun Amorphous Fe100-XGdX(18≤X≤70) Alloys

Abstract
The crystallization behavior and Curie temperature, T c, for the amorphous Fe100-X Gd X alloys prepared with a melt quenching method with wide range concentration (18≤X≤70) were studied by means of a thermomagnetization measurement. Final stable phases were determined from the measurement in the cooling process from 800°C. They are (i) α-Fe, Fe23Gd6 and Fe2Gd for X=22, (ii) α-Fe, Fe2Gd and α-Gd for 33.3≤X≤58, and (iii) Fe2Gd and α-Gd for X=70. The concentration dependence of T c has a maximum value of 320°C around X=40. T c in the present melt-spun ribbons is higher than that of thin films by about 100 degrees.

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