Influence of spin-orbit coupling on magneto-optical Kerr effect of a magnetic insulator
自旋-轨道耦合对磁性绝缘体磁光Kerr效应的影响

By using atomic energy level transition model for local electrons, microscopic quantum expressions of the magneto optical Kerr rotation (MOKR) are derived, taking into account both spin exchange splitting and spin orbit coupling interaction. Variation of the MOKR with the coupling constants of atomic ground state or excited states is investigated for the four level transition case. Results show that MOKR is not proportional to the spin orbit coupling splitting energy. It is advantageous to the enhancement of MOKR when the spin orbit coupling constant of the atomic ground states is positive or that of the excited states is negative.