CORRELATION BETWEEN THE BARKHAUSEN NOISE POWER AND THE TOTAL POWER LOSSES IN 3-PERCENT SI-FE

We present results on Barkhausen noise power in grain oriented 3% Si-F e samples of different quality (power losses). Barkhausen noise is mea sured at constant values of the magnetic field applied in the rolling direction of the sheet. The measurements indicate a strong correlation between the Barkhausen noise power and total power losses. A model is proposed to interpret the results according to which the Barkhausen n oise power is related to the density of pinning centers per unit coerc ive held, an intrinsic parameter of the material, It is shown that thi s parameter characterizes the ability of the external field to increas e the number of moving walls. The model and the experiment demonstrate that the power losses in grain oriented 3% Si-Fe are improved either by dynamic homogenization of magnetization, or by decreasing the domai n wall spacing in static conditions. (C) 1996 American Institute of Ph ysics.