Magnetic Properties and Thermal Expansion of Fe-Tb Amorphous Alloys

Measurements of the Curie temperature Tc, coercive force Hc, thermal expansion, and magnetoelasticity effects of Fe-Tb alloys in both film and bulk form, are reported. The compositional dependence of Hc was determined, and were found to be essentially the same for both film and bulk material. Anomalous thermal expansion curves, exhibiting either Invar effects or small expansion coefficients over a broad temperature range, were observed. Tc is slightly affected by the type of substrate and the temperature through the pressure effect, dTc/dP = ¿2 K/kbar.