Stability of the amorphous magnetic state against asymmetric magnetization reversal

Abstract

Magnetic instability during asymmetric magnetization reversal in crystalline materials was first investigated systematically by Nee1 who interpreted it as a superposition of the reptation (=accomodation) and bascule effects. We found similar effects in the amorphous Fe-B alloy but the changes of magnetic polarization were smaller than in the crystallized state, and there was a bigger stability region inside the hysteresis loop. The dependence on the number of magnetization reversals in the amorphous and appropriate crystalline materials is also different.

Viscosity, reptation and tilting effects in permanent magnets

“…If H B is very close to H A or if the state of the material is such that no irreversible magnetization processes occur as the field is cycled between these two extremities, then H r 0 and no reptation effect will be observed. Hence reptation is observed only in sufficiently 'disordered' samples [23,24], in which there are significant variations in the successive paths traced across the free-energy surface as the field is cycled between H A and H B .…”