铁磁性物质中法拉第磁光效应及其温度特性的量子理论

Quantum theory of the Faraday magneto-optic effect and its temperature properties in ferromagnetic media

在铁磁性物质中,磁光效应除了来源于自旋-轨道相互作用所导致的激发态能级分裂以外,还来源于交换作用和外磁场所导致的基态能级分裂。根据这一理论进行的计算表明,在远低于居里温度和高温、高居里点两种极端情形,法拉第旋转θ与磁化强度M呈线性关系。在一般温度区域,θ与M及温度T呈非线性关系。

Magneto-optical effect in ferromagnetic media, besides originating from the excited state splitting reiulting spin-orbit interaction, also arises from the groun state splitting caused by both the exchange interaction and applied field. Based on suchd anaiysis, it is shown by calculation tl at the Faraday rotation has a linear dependance on magnetization M in both iegjons of T<<Tc, (Curie temperature) and high temperature for the medium with high Tc, and a non-linear dependance on both M and T in the normal temperature region.