采用磁光旋转测量装置与1/4波片组合而成的实验装置测量了(BiTm)3(FeGa)5O(12)单晶薄膜样品的磁圆二向色性(椭圆率tanhθ″),以及θ″与磁场强度H、样品厚度2h的关系。测量密度达0.01°。实验证明了磁光旋转的虚部θ″与实部θ′一样,是与磁化强度M相联系的,且随样品厚度线性增加。

An experimental set-up consisting of a measuring device of magnetooptic rotation and a quarter-wave plate is used to measure the magnetic circular dichroism (ellipticity tanh θ") of (BiTm)3(FeGa)5O12 single crystal films and the change of θ" as a function of the magnetic field intensity H and sample thickness 2h. The measuring accuracy is 0.01°. Experimental results have proved that the imaginary part of magneto-optie rotation is also related to the magnetization intensity M just as the real part, and that it changes linearly with the sample thickness.