Depth dependence of spin-specific magnetization hysteresis loops measured by magnetic Compton scattering

Abstract

An application of magnetic Compton scattering to measure the depth dependence of spin-specific magnetization hysteresis (SSMH) loops in a Nd–Fe–B sintered magnet is presented herein. The depth dependence of SSMH was obtained by changing the position of x-rays with a vertical beam size of 10 μm. The results show that the surface deterioration area has a depth of 120 μm, where the magnetization begins to decrease gradually. In the internal region, we also observed decreased coercivity, which might be caused by the demagnetizing field.