The effect of temperatures on the coercive field of polycrystalline wires of 72% Fe-Ni

The present paper investigates the mechanism governing the coercive field in polycrystalline wires of Fe-Ni with 72% Ni, plastically deformed. Experimental results on the temperature dependence of the coercive field are reported, both when an external stress equal to the flow-stress is applied to samples and, successively, when it is released. The experiments are compared to the theoretical models based on the coherent rotation and mobility of the domain walls.