Research on the quaternary diluted magnetic semiconductor films exhibiting the large Faraday-rotation and their magneto-optical application to the high frequency magneto-optical sensors

II-VI族半导体CdMnTe被称为稀磁半导体（DMS），其显示出顺磁特性并且在室温下显示出相当大的法拉第效应。在DMS晶格中，Mn的存在导致由于Mn^<2+>离子的3d电子和带电子引起的局部磁矩之间的自旋-自旋交换相互作用。这种相互作用在室温下产生了法拉第效应。由于这样的特性，CdMnTe从其在磁光器件上的应用观点来看已经成为主要的兴趣。为了提高DM 5薄膜的磁光性能，我们研究了用分子束外延（MBE）方法在透明SiO_2石英玻璃衬底上制备的四元DMCdMnCoTe薄膜的法拉第旋转，发现薄膜中的法拉第效应增强。从磁光应用的角度研究了CdMnCoTe薄膜的磁光性能，并对薄膜的磁光性能进行了分析。结果表明，DM 5薄膜的磁光性能与DM 5薄膜的磁光性能有很大的关系。 关于我们 可见区域。本研究的主要内容如下：（1）采用半导体激光器作为光源，在635 nm处直接观察到QG衬底上顺磁性MnCo：DMS厚膜的法拉第效应。（2）MnCo：DMS薄膜对磁场具有线性响应特性，Cd_<0.43>Mn_<0.54>Co_<0.03>Te薄膜在635 nm处的光吸收与Cd_<0.40>Mn_<0.60>Te薄膜相同，因此CdMnCoTe薄膜的优值比CdMnTe薄膜提高了4倍。通过在较薄的基片上制备5μm以上的厚膜和提高光学系统的透过率，可望进一步提高法拉第旋转信号的信噪比。我们将继续努力，以研制我们研制的具有大法拉第旋转的四元DMS膜的高频磁光传感器。少

The II-VI semiconductor CdMnTe is known as a diluted magnetic semiconductor (DMS) that shows paramagnetic characteristics and exhibits a considerable Faraday effect at room temperature. In the DMS lattice, the presence of Mn leads to a spin-spin exchange interaction between the localized magnetic moments due to 3d electrons of the Mn^<2+> ion and the band electrons. This interaction gives rise to the Faraday effect at room temperature. Because of such characteristics, the CdMnTe has become of major interest from its application viewpoint to magneto-optical devices. In order to improve the magneto-optical property in DM5 films, we have studied the Faraday rotation in the four-element DMS CdMnCoTe films deposited on transparent SiO_2 quartz glass substrates by using molecular beam epitaxy (MBE), and showed that the Faraday effect is enhanced in those films.In this research, the magneto-optical properties of CdMnCoTe films are studied from the viewpoint of magneto-optical application in t … More he visible region. The Faraday effect in the CdMnCoTe films is compared with that of the CdMnTe film and a ferrimagnetic garnet filmThe following were performed in this research : (1)The Faraday effect in the paramagnetic MnCo : DMS thick film on QG substrate was directly observed at 635 nm using a laser diode as the light source. (2)The linear characteristics to the magnetic fields were clarified in the MnCo : DMS film.Optical absorption for Cd_<0.43>Mn_<0.54>Co_<0.03>Te film at 635 nm is identical for Cd_<0.40>Mn_<0.60>Te film, and, therefore, the figure of merit has been improved in the CdMnCoTe film by four times to the CdMnTe film. It is expected that the signal to noise ratio of the Faraday-rotation signal can be further improved by preparing thick films more than 5μm on thinner substrates and raising transmissivity of the optical system.We are going to continue with every effort in order to develop the high-frequency magneto-optical sensors using quaternary DMS films, which exhibit the large Faraday-rotation, developed by us. Less