Investigation of Magneto-Optical Properties of Diluted Magnetic Semiconductor Superlattice and Magnetic Garnet Films with the In-plane Magnetization

第一年()：今年的目标是用分子束外延方法研究在(0001)蓝宝石衬底上生长CdMnTe外延膜或CdMnTe-CdTe超晶格薄膜的条件。作为外延薄膜的结果，我们通过X射线衍射和紫外光透过率的测量，以及RHEED观察，证实了所采用的方法可以获得高质量的薄膜。第二年(1990年)：今年的目的是研究所获得的外延薄膜的磁光性质。结果表明，在Cd&lt；1-x&Gt；MnxTe薄膜中，当摩尔比x为0.1时，Cd&lt；1-x&Gt；MnxTe薄膜的800 nm吸收边由长边向短边移动了约50 nm(0.1 eV)。对于法拉第旋转角，在0.6米波长下，当x=0.1和x=0.3时，可以得到-0.1°/cm/Gauss和-2.5°/cm/Gauss的旋转值，与已有报道的值相比，这些值是比较大的。我们将进一步发展这些特点。这些结果已经在第14届磁学年会和《电子报》上发表。实验室研究。关于磁性石榴石外延薄膜的磁光性质，已经观察到了大的互易效应，这些结果已经在IEICE技术报告OQE89-124中得到了报道。

The first year (1989) :The aim of this year was to investigate the growth condition of CdMnTe epitaxial films or CdMnTe-CdTe superlattice films on (0001) sapphire substrates using a molecular beam epitaxial method. As the result of epitaxy of those films, we have confirmed by the measurements of x-ray diffraction and UV transparency, and RHEED observations that the good quality films can be obtained using the employed method.The second year (1990) :The aim of this year was to investigate the magneto-optical properties with respect to the epitaxial films obtained. It was confirmed that by the substitution of Cd by Mn in Cd_<1-x>Mn_xTe films the absorption edge which exhibits at 800 nm in the CdTe films shifts from the long wavelength side to the short one by about 50 nm (0.1 eV) per a molar ratio x of 0.1. As to the Faraday rotation, -0.1 deg/cm/gauss in a films with x=0.1 and -2.5deg/cm/gauss in that of x=0.3 could be obtained at a wavelength of 0.6 m. These values are comparatively large, comparing with values which have been reported so far. We are going to develop these characteristics furthermore. Those results have been reported at the 14th annual conference on Magnetics and in Rep. Elec. Res. Lab. Vol. 6 1990.As to the magneto-optical properties of Magnetic garnet epitaxial films, it has been made clear that the large reciprocal effect is observed and these results have been reported in IEICE Technical Report OQE89-124.