Control of spin polarization by voltage for the magneto-optical devises

对于压控自旋极化多层材料的制备，实验按步骤1进行。建立了薄膜制备和分析仪器。1)建立了氧化薄膜制备装置和原位测量系统。2)建立了穆斯堡尔效应的测量系统。建立了纳米氧化层的制备及分析方法。1) CoFe-NOL（nano - oxide layer）的结构和磁性能研究。2)高介电常数Ta_2O_5的制备研究。金属/天然氧化物多层膜的结构和磁性能研究。1) mnomo的制备与结构分析2)压控自旋极化多层材料的设计建立了导电原子力显微镜对纳米氧化层的估计方法。从磁冷却效应下的磁化过程和穆斯堡尔谱分析，阐明了CoFe和Fe超薄氧化物的磁性结构。我们还成功制备了高介电常数的超薄Ta_2O_5。以超薄Ta_2O_5为材料，讨论了金属/天然氧化物多层材料的压控自旋极化多层材料的设计。电压控制的自旋极化实验应继续进行。

For the fabrication of the voltage controlled spin polarization multilayer, the experiment has been carried out by following step.1.The apparatus for the fabrication and analysis of the thin film was set up.1)The apparatus for the fabrication of oxide thin film and in-situ measurement system was set up.2)The measurement system for the Mossbauer effect was set up.2.The establishment of the fabrication and analysis method for the Nano-Oxide-Layer.1)Study for the structural and magnetic properties of CoFe-NOL(Nano-Oxide-Layer).2)Study on the fabrication of Ta_2O_5 with high dielectric constant.3.Study for the structural and magnetic properties of MNOM (metal/native oxide multilayer).1)Fabrication and structural analyses of MNOM2)The design of the voltage controlled spin polarization multilayerThe estimation method of the nano-oxide layer by using the conductive atom force microscope was established. From the analysis of magnetization process under magnetic cooling effect and Mossbauer spectrum, the magnetic structure of ultra thin oxide of CoFe and Fe were clarified. We also succeeded in the fabrication of ultra thin Ta_2O_5 with high dielectric constant. The design of the voltage controlled spin polarization multilayer by the metal/native oxide multilayer was discussed by using ultra thin Ta_2O_5. The experiment for the spin polarization controlled by voltage should be continued.