文章信息/Info

Title:

Research Progress on Ultrafast Spin Dynamics Induced by Femtosecond Laser Pulse

文章編號:

1674-3962(2021)12-0972-10

作者:

張偉1; 2; 張曉強1; 劉永山1; 2; 姜蕓青1; 2; 許涌1; 2; 趙巍勝1; 2

（1. 北京航空航天大學 合肥創新研究院，安徽 合肥 230012）（2. 北京航空航天大學集成電路科學與工程學院，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)

關鍵詞:

磁性材料; 自旋動力學; 全光學磁矩翻轉; 磁阻尼; 飛秒脈沖激光

Keywords:

magnetic materials;  spin dynamics;  all�瞣ptical magnetization reversal;  damping;  femtosecond laser pulse

分類號:

O47

DOI:

10.7502/j.issn.1674-3962.202107035

文獻標志碼:

A

摘要:

當前，由于自旋電子學器件的工作頻率越來越高，磁性材料中超快自旋動力學的研究已經成為凝聚態物理領域的一大研究熱點。同時，飛秒脈沖激光泵浦磁性材料導致的超快自旋動力學現象蘊含豐富的物理內涵，涉及到電子、聲子和自旋在非平衡態下的量子多體相互作用等基本問題，從而開辟了磁學研究的一個新方向——飛秒磁學。基于此，系統綜述了飛秒脈沖激光誘導超快自旋動力學的發展歷程、實驗裝置、理論和實驗研究的重要進展以及磁光領域的重要應用——全光學磁矩翻轉效應。通過系統綜述相關研究結果，發現要想更準確、更深入地研究超快自旋動力學的微觀機制，還需要建立超越唯象的研究模型，發展更直接的描述方法，從而尋找具有高熱穩定性、高自旋極化率、低功耗和高速存儲等優點的新材料，以期設計出具有超低能耗、超快響應的新型自旋電子學器件。

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.