磁性隧道结中自旋塞贝克效应的研究

本项目以磁性隧道结为对象，研究势垒层两边铁磁电极之间由于温度梯度所产生的热电势，即自旋塞贝克效应（Spin Seebeck Effect）；主要包括热电势的大小、符号、稳定性、以及上述性质与磁性隧道结本征特性的内在关系。重点研究磁性隧道结中自旋塞贝克效应的机理问题，包括自旋塞贝克电压大小与磁性隧道结中磁电阻比值的关系；研究上下铁磁电极之间温度梯度对磁性隧道结中自旋相关输运特性的影响，如偏压、温度依赖关系；研究外加磁场改变上下铁磁层磁化方向的相对取向、界面结构、以及势垒材料等对自旋塞贝克效应的影响。探索在1到2纳米厚势垒层两边产生均匀、可调的温度梯度的方法；探索产生与调控磁性隧道结中自旋塞贝克效应的方法和技术；探索自旋塞贝克效应在自旋电子学器件中的应用原理和方法；重点解决自旋塞贝克效应在应用中的基础物理问题、结构设计、和材料优化等。

The project is based on the magnetic tunnel jucntions, with a focus on the thermalvoltage generated by a temperature gradient across the barrier, called spin Seebeck effect. The research mainly includes the amplitude, sign, stability of the spin Seebeck voltage, and its relationship with the intrinsic behavior of magnetic tunnel junctions. The key research is focused on the fundamental physics of spin Seebeck effect in the magnetic tunnel junctions, including the relationship between the amplitude of Seebeck voltage and the MR ratio in the magnetic tunnel junctions. The project will investigate the effects of the configuration of two ferromagentic layers, the interfacial structures, and the barrier materials on the spin Seebeck effect. The aim is to explore the pontential methods to generate an uniform and controllable temperature gradient across the junctions, to explore the methods and technology to generate and manipulate the thermalvoltage across the barrier, and to explore the principles of the application of spin Seebeck effect in spintronic devices, with a focus on the materials and physics.