Concentration and Temperature Dependences of Coercive Force in Fe-Sm Amorphous Alloys

The concentration and temperature dependences of coercive force have been studied on Fe-Sm and other Fe-rare earth (R) amorphous alloys prepared by sputtering. The coercive force of Fe-Sm amorphous alloys shows a large concentration dependence, as expected by the random anisotropy model. There is a linear relationship between log Hc and T. For ferrimagnetic-like, amorphous alloys, there are two such linear relationships, with different slopes, at higher and lower temperatures. The magnitude of the coercive force of Fe66.7R33.3 amorphous alloys depends on the second order electrostatic field, except in the case of Fe-Ce.