克尔磁光效应的经典理论分析

Classical theoretical analysis of Kerr magneto-optical effects

本文引入与自旋-轨道相互作用等有关的有效场概念,运用经典电磁场理论,推导了磁光克尔旋转的明确表达式.证明了各种磁光介质的极向克尔旋转θ_k的实部θ′_k和虚部θ″_k均与有效场H_i成正比,在铁磁性介质中近似与vM成正比,M为磁化强度,在亚铁磁性等介质中近似与(?)v_iM_i成正比,M_i为i次点阵的磁化强度.同时还证明了近似的横向克尔旋转θ_k^t与H_i^2正比;θ_k和θ_k^t的温度特性取决于H_i的温度特性.

The effective field acting on orbital motion electrons, which is relative to the interaction between spin and orbit and so on, is introduced into this paper. The definite expression of magneto-optical Kerr rotation is deduced by means of the classical electromagnetic field theory. It is proved that the real part 0'k and imaginary part 0k' of the polar Kerr rotation θk are directly proportional to the effective field Hi. The quasi-transverse Kerr rotation θkt is directly to Hi2. The temperature characters of θk and θkt depend on that of Hi.