Magnetic Properties and Thermal Expansion of Fe-Tb Amorphous Alloys

Measurements of the Curie temperature T
_c
, coercive force H
_c
, thermal expansion, and magnetoelasticity effects of Fe-Tb alloys in both film and bulk form, are reported. The compositional dependence of H
_c
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. T
_c
is slightly affected by the type of substrate and the temperature through the pressure effect, dT
_c
/dP = -2 K/kbar.