The effect of stress on the domain wall behavior of high permeability grain-oriented electrical steel

This paper studies the effect of applied tensile stress on the hysteresis loop and magnetic microstructure characteristics with domain wall (DW) behavior based on the magneto optical imaging. Both B-H curve and magnetic DW behavior of high permeability grain oriented (HGO) electrical steel sample are measured and validated to be highly correlated with the applied tensile stresses by using a longitudinal Magneto-Optical Kerr Effect microscopy. Specially, the optical flow (OF) algorithm is used to track the DW motion, and the velocity of DW movement is verified to be decreased against the increase of tensile stress based on the OF velocity field. The variation of hysteresis loop is also closely related with change of speed of DW motion. This study provides detailed understanding on the relationship between macro and micro magnetic properties of HGO steel under tensile stress.