高饱和磁化强度和高居里温度Ge基磁性半导体、异质结的制备及其磁性和电输运性质研究

项目名称： 高饱和磁化强度和高居里温度Ge基磁性半导体、异质结的制备及其磁性和电输运性质研究

项目编号： No.11204164

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 秦羽丰

作者单位： 山东农业大学

项目金额： 28万元

中文摘要： 磁性半导体材料在自旋电子学器件中应用前景广阔，得到了国内外科学界的广泛关注。Ge基磁性半导体因与传统Si半导体工艺兼容性好，并具有大的本征空穴迁移率而备受关注。我们计划在前期Ge基磁性半导体研究的基础上开展如下工作：1. 严格控制生长条件，得到过渡金属元素含量高的匀质Ge基磁性半导体材料，进而得到大的饱和磁化强度和较高的居里温度；2. 通过微结构表征和磁致旋光光谱等揭示Ge基磁性半导体的磁性起源；3. 通过氢化和少量非磁金属元素掺杂实现对Ge基磁性半导体载流子浓度的调控，揭示自旋极化空穴载流子浓度对磁化强度、居里温度和电输运机制的影响，研究Ge基磁性半导体在金属边导电区的电输运性质；4. 制备出室温整流特性对电场和磁场更加敏感的Ge基磁性半导体异质结，在此基础上制备Ge基磁性半导体场效应管，并研究其电输运性质。本课题将为Ge基磁性半导体应用于自旋电子学器件提供材料基础和器件支持。

中文关键词： 自旋电子学；IV族磁性半导体；异质结；Heusler 合金；铁磁共振

英文摘要： Ferromagnetic semiconductors have received worldwide attention due to their potential applications in spintronics devices. Ge-based Ferromagnetic semiconductors have attracted considerable attention for their good compatibility with present Si-based processing technology and their potential application in high performance devices due to the higher carrier mobility than Si. On the basis of the previous studies on Ge-based ferromagnetic semiconductor, we plan to undertake the following tasks: 1. To obtain homogeneous Ge-based ferromagnetic semiconductor with high content of transition metal, and thus the high saturation magnetization and Curie temperature; 2. To reveal the magnetic origin of the Ge-based magnetic semiconductor by Microstructural characterization and Magneto-optical rotation spectroscopy; 3. To control the concentration of hole carries in Ge-based magnetic semiconductors through hydrogenation and little doping of non-magnetic metal. In this way we should reveal the influence of spin polarization carries on the magnetization, Curie temperature and electrical transport property. And furthermore we will investigate the electrical transport property of Ge-based ferromagnetic semiconductor on the metallic side of the metal-insulator transition; 4. Try to synthesize Ge-based ferromagnetic semiconductor h

英文关键词： Spintronics；IV group ferromagnetic conductor；Heterojunction；Heusler compounds；ferromagnetic resonance