飞秒脉冲激光诱导超快自旋动力学研究进展-中国材料进展

文章信息/Info

Title:: Research Progress on Ultrafast Spin Dynamics Induced by Femtosecond Laser Pulse

作者:: 张伟1; 2; 张晓强1; 刘永山1; 2; 姜芸青1; 2; 许涌1; 2; 赵巍胜1; 2; （1. 北京航空航天大学合肥创新研究院，安徽合肥 230012）（2. 北京航空航天大学集成电路科学与工程学院，北京 100191）

Author(s):: ZHANG Wei1; 2; ZHANG Xiaoqiang1; LIU Yongshan1; 2; JIANG Yunqing1; 2; XU Yong1; 2; ZHAO Weisheng1; 2; (1. Hefei Innovation Research Institute, Beihang University, Hefei 230012, China ) (2. School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China)

Keywords:: magnetic materials; spin dynamics; alloptical magnetization reversal; damping; femtosecond laser pulse

摘要:: 当前，由于自旋电子学器件的工作频率越来越高，磁性材料中超快自旋动力学的研究已经成为凝聚态物理领域的一大研究热点。同时，飞秒脉冲激光泵浦磁性材料导致的超快自旋动力学现象蕴含丰富的物理内涵，涉及到电子、声子和自旋在非平衡态下的量子多体相互作用等基本问题，从而开辟了磁学研究的一个新方向——飞秒磁学。基于此，系统综述了飞秒脉冲激光诱导超快自旋动力学的发展历程、实验装置、理论和实验研究的重要进展以及磁光领域的重要应用——全光学磁矩翻转效应。通过系统综述相关研究结果，发现要想更准确、更深入地研究超快自旋动力学的微观机制，还需要建立超越唯象的研究模型，发展更直接的描述方法，从而寻找具有高热稳定性、高自旋极化率、低功耗和高速存储等优点的新材料，以期设计出具有超低能耗、超快响应的新型自旋电子学器件。

Abstract:: Nowadays, the working frequency of spintronic devices becomes higher and higher, so that ultrafast spin dynamics in magnetic materials is as one of research focuses in condensed matter physics. Meanwhile, ultrafast spin dynamics in magnetic materials induced by femtosecond laser pulse is rich in physical meaning. It involves the basic problem of multiparticle quantum interaction among electrons, phonons and spins under non-equilibrium state. As a result, a new direction in magnetism has been founded as femtosecond-magnetism. Based on the above, the main progresses and important applications of ultrafast spin dynamics induced by femtosecond laser pulse were reviewed, including experimental equipments, theoretical and experimental models, as well as all-optical magnetization reversal effect. Therefore, in order to explore the micro-mechanism of ultrafast spin dynamics in a deeper level, a new research model should be established to develop direct descriptions. Furthermore, a crucial task is to find out new materials with high thermal stability, high spin polarization, low power consumption and high storage rate. Therefore, novel spintronic devices with low power consumption and ultrafast response could be designed in the near future.