磁性纳米复合热电材料的磁电效应和热电性能提升研究

项目名称： 磁性纳米复合热电材料的磁电效应和热电性能提升研究

项目编号： No.11274248

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 赵文俞

作者单位： 武汉理工大学

项目金额： 95万元

中文摘要： 相对独立调控Seebeck系数和电导率是当前热电材料领域的挑战性难题。针对实验发现的填充CoSb3价带电子结构收敛现象，提出拟通过铁磁金属、稀磁半导体和磁性绝缘体纳米粒子与填充CoSb3基体的纳米复合制备磁性纳米复合热电材料，运用外加磁场调控该材料中磁性纳米粒子的磁化方向，研究不同磁化方向条件下磁振子产生的自旋Seebeck效应、自旋迁移力矩和磁振子拖曳热电势等磁电效应对填充CoSb3电子结构的影响规律，确定将填充CoSb3价带顶Co3d5/2精细电子态电子激发至导带的磁振子属性，揭示填充CoSb3价带电子结构收敛与电输运性能之间的关系，阐明磁振子磁电效应调控填充CoSb3热电材料Seebeck系数和电导率的物理机制。在此基础上，建立基于磁振子磁电效应的Seebeck系数和电导率相对独立调控方法，为实现填充CoSb3热电材料电输运性能的大幅度提高和热电性能ZT的更大突破提供新的途径。

中文关键词： 热电材料；磁性纳米粒子；纳米复合；热电磁效应；热电性能

英文摘要： Relatively independent regulation of Seebeck coefficient and electrical conductivity is now a challenging problem in the field of thermoelectric materials. The research program of this project is suggested based on the convergence phenomenon of the valence band electronic structure of filled CoSb3 experimentally discovered by us. A series of magnetic nanocomposite thermelectric materials, which are composited of filled-CoSb3 matrix and nanoparticles of ferromagnetic metals, diluted magnetic semiconductor or magnetic insulator, have been prepared by nanocomposite approach. An external magnetic field is employed to adjust the magnetization direction of the nanoparticles in these magnetic nanocomposite thermelectric materials. The research works of this project are included: (1) to investigate the influences of various magnetoelectric effects produced by magnon, such as spin Seebeck effect, spin transfer torque effect, magnon-drag thermopower, and so on, on the electronic structure of filled CoSb3 under different magnetization directions; (2) to determine the properties of the magnon that can excite the electron transformation from the Co 3d5/2 fine electronic states in the conduction band maximum to the conduction band of filled CoSb3; (3) to reveal the relationship between the valence band electronic structure co

英文关键词： Thermoelectric materials；Magnetic nanoparticles；Nanocomposite；Thermo-electro-magnetic effects；Thermoelectric properties