Effects of tensile stress on magnetic Barkhausen emissions in amorphous Fe-Si-B alloy

Magnetic hysteresis and Barkhausen emissions have been measured for amorphous Fe82B10Si8 samples with positive magnetostriction of lambda(s) = 27 x 10(-6) under tensile stress of up to 35 MPa. The root mean square voltage of the Barkhausen signal and the number of events per cycle increased monotonically with the applied stress. The results are explained in terms of a theory which includes a stress-dependent hysteresis model and a stochastic process model for the Barkhausen emissions.