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

为了制备电压控制的自旋极化多层膜，实验分以下几个步骤进行：1)建立了薄膜的制备和分析装置；1)建立了氧化物薄膜的制备装置和原位测量系统；2)建立了穆斯堡尔效应测量系统；2)建立了纳米氧化层的制备和分析方法；2)研究了CoFe-NOL(纳米氧化层)的结构和磁性；2)研究了高介电常数Ta_2O_5的制备针对MNOM(金属/自然氧化物多层膜)的结构和磁性，1)MNOM2的制备和结构分析)压控自旋极化多层膜的设计利用导电原子力显微镜建立了纳米氧化层的估算方法。通过对磁致冷效应下的磁化过程和穆斯堡尔谱的分析，阐明了CoFe和Fe超薄氧化物的磁结构。我们还成功地制备了高介电常数的超薄Ta2O5。讨论了用超薄Ta_2O_5实现金属/自然氧化物多层膜的电压控制自旋极化多层膜的设计。电压控制自旋极化的实验有待继续。

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.