PREDICTION OF MAGNETIC HYSTERESIS IN FECOB AMORPHOUS MATERIALS USING THE DYNAMIC PREISACH MODEL

Dynamic hysteresis loops and losses were measured d on Fe64Co21B15 amo rphous ribbons submitted to different annealing conditions, The result s were analyzed by the Dynamic Preisach Model, The model can directly predict both the loop shape and the loss behavior vs frequency, on the basis of the Preisach distribution and of the linear dimension, Delta l, of the correlation regions providing coherent magnetization change s, We estimated correlation lengths from Delta l approximate to 80 mu m (as-cast case) to Delta l approximate to 250 mu m (field-annealed ma terial).