DISSIPATION IN QUASI-STATICALLY DRIVEN DISORDERED-SYSTEMS

This work presents an analysis of hysteresis and dissipation in quasis tatically driven disordered systems. The study is based on the random field Ising model with fluctuationless dynamics. It enables us to sort out the fraction of the energy input by the driving field stored in t he system and the fraction dissipated in every step of the transformat ion. The dissipation is directly related to the occurrence of avalanch es, and does not scale with the size of Barkhausen magnetization jumps . In addition, the change in magnetic field between avalanches provide s a measure of the energy barriers between consecutive metastable stat es.