Effect of Previous History on Switching Rate in Ferrites

Abstract

Existing theories of switching of square-loop ferrites indicate that the rate of switching is a function of the present state of magnetization and of the applied field. Experiments are described which show that the switching rate is also dependent on previous history. Two cases have been studied. In the first case, the ferrite was partially switched to a predetermined extent by a pulse of variable amplitude and then the switching cycle was completed by a pulse of fixed amplitude. In the second, the ferrite was brought to the remanent state by a pulse of variable amplitude before the switching cycle. Changes as great as two to one in switching rate were produced by variations of previous treatment.