Thermal Expansion Anomaly in Some Ferromagnetic Amorphous Alloys

Amorphous samples have been made by the roller quenching and the centrifugal solidification techniques in the form of ribbons 20～40μm thick and 0.5～1mm wide. Thermal expansion properties of the ferromagnetic amorphous alloys have been examined for various Fe-base and Co-base alloys. In the thermal expansion curves, the Fe-base amorphous alloys exhibit a large anomaly below the Curie temperature, while the Co-base amorphous alloys exhibit no distinct anomaly in the vicinity of the Curie temperature. It is concluded that the anomaly in the thermal expansion of Fe-base alloys is closely connected with a large spontaneous volume magnetostriction