Dynamic hysteresis in Finemet thin films

In this paper, we present a series of dynamic measurements on a set of Finemet thin films, having thickness ranging from 200 /spl Aring/ to 5 /spl mu/m, by using both magneto-optical Kerr effect (MOKE) and the fluxmetric inductive method. Unexpectedly, the data show two completely different hysteresis behavior, showing relevant differences in their frequency dependences. In particular, optical hysteresis is easily explained by a simple depinning model which can be solved analytically.