稀磁半导体Cd＿（1－x）Mn＿xTe，Cd＿（1－x）Fe＿xTe的巨法拉第效应

用消光法、交替磁场法和磁光调制法测量了不同温度下、不同组分的稀磁半导体Ｃｄ＿（１－ｘ）Ｍｎ＿ｘＴｅ和Ｃｄ＿（１－ｘ）Ｆｅ＿ｘＴｅ的巨法拉第效应。实验表明：对较高组分的，法拉第旋转角为负，用单振子模型能很好地描述实验结果。稀磁半导体Ｃｄ＿（１－ｘ）Ｆｅ＿ｘＴｅ表现出与Ｃｄ＿（１－ｘ）Ｍｎ＿ｘＴｅ同量级的巨法拉第效应，当组分较低时，法拉第旋转角随入射光子能量出现由正到负的变化，必须用多振子模型才能很好解释实验结果。当样品很薄或磁场较低时，磁光调制法以其很高的测量精度显示出巨大的优越性。

Giant Faraday Rotation in Diluted Magnetic Semiconductors Cd_(1-x)Mm_xTe and Cd_(1-x)Fe_xTe

Giant Faraday rotation as a function of photon energy and composition for Cd_(1-x)Mn_xTe and Cd_(1-x)Fe_xTe in temperature range 70 K to 300 K has been mea-sured by using extinction, alternating magnetic field and magneto-optical modula-tion methods. Faraday rotation angles are negative and a single-oscillator model fit the data very well for Cd_(1-x)Mn_xTe with relatively high compositions.It is shown that Cd_(1-x)Fe_xTe crystals exhibit the same order giant Faraday rotation characteristic as Cd_(1-x)Mn_xTe. With relatively low composition x, Faraday rotation angles vary frorn positive to negative when photon energy close to the band gap edge ,a multioscillator model has been successfully used to explain the data. Alter-nating magnetic field method is found to be the best one in this region, however,magneto-optical modulation method takes advantages of its high accurate for thin samples or under low rnagnetic field.