自旋与机械耦合效应研究

项目名称： 自旋与机械耦合效应研究

项目编号： No.11204245

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： 于昊

作者单位： 西交利物浦大学

项目金额： 25万元

中文摘要： 对于自旋的输运和操控是自旋电子学研究的核心问题。电子自旋具有角动量属性，可以与机械转动角动量相耦合和相互转化。本项目立足于研究自旋与机械转动、机械应力的耦合作用。分别采用LLG方程、运动学方程与边界条件、自旋与应力张量耦合的哈密顿量、自旋点阵的蒙特卡洛模拟等计算方法，针对磁性金属、氧化物隧道结、窄带半导体等不同体系深入研究其自旋-机械耦合效应。探索存在应力导致的自旋轨道作用下的自旋与机械耦合模式，揭示自旋-机械耦合效应的微观机制和宏观动力学过程，建立自旋-磁化-机械耦合的半定量物理图像。为研制探测、产生和操控自旋流的新型装置提供物理基础和理论依据。本项目的开展将对增强操控自旋的手段，对研制新一代自旋电子学器件具有显著意义。

中文关键词： 自旋电子学；角动量耦合；自旋与机械转动；磁化动力学；

英文摘要： The control of spin is the core issue of spin electronics. Spin, an intrinsic property of electron, is a sort of angular momentum. Therefore, based on the conservation of angular momentum, the spin can couple to mechanical rotational angular momentum. This project is to investigate the coupling of spin to mechanics or stress. The approaches employed in this study include, LLG equation, the equation of motion and boundary condition, Hamiltonian with coupling of spin to stress, and spin-lattice Monte Carlo method. The objects involve magnetic metal, oxide tunneling junction, and narrow-band semiconductor. We will study the mechanism of spin-mechanics coupling in these three structures and explore thespin0mechanics coupling due to strain-induced spin-orbit-interaction(SOI). The aims are to find the micro mechanism of the coupling, and the dynamic process in macro scale and to build the physics picture of spin-magnetization-mechanics coupling. It is the theoretical and fundamental knowledge for the future equipment in the field of detecting, producing and controlling spins. The research is significant for the next generation spintronics devices.

英文关键词： spintronics；coupling of angular momentum；spin and mechanical rotation；dynamics of magnetization；