| 交变磁场下法拉第效应研究 |
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| 引用本文： | 龚小燕,刘公强.交变磁场下法拉第效应研究[J].光学学报,1995,15(4):86-491. |
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| 作者姓名： | 龚小燕 刘公强 |
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| 作者单位： | 上海交通大学应用物理系，上海科技大学物理系 |
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| 基金项目： | 中国科学院上海冶金研究所信息功能材料国家重点实验室,物理研究所磁学国家重点实验室的资助 |
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| 摘 要： | 介绍了交变法拉第效应的磁光调制测量原理和方法，分析了亚铁磁材料法拉第Ｆｒａｄａｙ效应和磁光调制深度与交变磁场频率间的关系，证明了交变法拉第旋转幅值θ０的实部θ０小于静磁场下的θ＇ｓ，而虚部θ＇＇０大于θ＇＇ｓ，理论和实验结果相吻合，由此得出结论，采用具有磁圆二向色性的磁光材料做成的调制器不可能达到彻底的开关状态。
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| 关 键 词： | 法拉第效应 交变磁场 磁圆二向色性 磁光调制器 |
| 收稿时间： | 1994/3/16 |
The Faraday Effect in the Alternating Magnetic Field |
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| Zhang Ninggao,Gong Xaoyan, Liu Gongqiang,Chen Yixin.The Faraday Effect in the Alternating Magnetic Field[J].Acta Optica Sinica,1995,15(4):86-491. |
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| Authors: | Zhang Ninggao Gong Xaoyan Liu Gongqiang Chen Yixin |
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| Abstract: | The principle and method of the magneto-optical modulation measuring the Faraday effect in a sine magnetic field have been proposed. A theoretical analysis has been performed on the magnetic field-frequency dependence of both the Faraday effect and the degree of the magneto-optical modulation in ferrimagnetic medium.It has been shown that θ',the real part of the Faraday rotation θ,in an alternating magnetic field is smaller than that in a static field, while the imaginary part θ″ is larger than that in a static field. The theory corresponds with the experimental results. The conclusion has been drawn that it is imposible to realize complete on-off switch by a modulator utilizing magneto-optical materials with magnetic circular dichroism. |
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| Keywords: | Faraday effect alternating magnetic field magnetic circular dichroism |
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