Effects of uniaxial stress on magnetic field-induced domain wall motion

The applied AC magnetic field intensity dependence of asymmetry in an MAE (magnetoacoustic emission) burst under uniaxial compressive stress was investigated with a temper embrittled HY80 steel sample. The results showed that existence of a threshold in the AC field intensity that triggers the asymmetry. An increase in compressive stress magnitude was seen to increase this threshold value, and the maximum output of the currently available magnetizing unit was insufficient to create an asymmetric MAE pattern under 200 MPa. The degree of embrittlement may not affect the detection of residual compressive stress in this material