文章信息/Info

Title:

Research Progress on Ultrafast Spin Dynamics Induced by Femtosecond Laser Pulse

文章編號(hào):

1674-3962(2021)12-0972-10

作者:

張偉1; 2; 張曉強(qiáng)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(xué) 合肥創(chuàng)新研究院，安徽 合肥 230012）（2. 北京航空航天大學(xué)集成電路科學(xué)與工程學(xué)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(guān)鍵詞:

磁性材料; 自旋動(dòng)力學(xué); 全光學(xué)磁矩翻轉(zhuǎn); 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(lèi)號(hào):

O47

DOI:

10.7502/j.issn.1674-3962.202107035

文獻(xiàn)標(biāo)志碼:

A

摘要:

當(dāng)前，由于自旋電子學(xué)器件的工作頻率越來(lái)越高，磁性材料中超快自旋動(dòng)力學(xué)的研究已經(jīng)成為凝聚態(tài)物理領(lǐng)域的一大研究熱點(diǎn)。同時(shí)，飛秒脈沖激光泵浦磁性材料導(dǎo)致的超快自旋動(dòng)力學(xué)現(xiàn)象蘊(yùn)含豐富的物理內(nèi)涵，涉及到電子、聲子和自旋在非平衡態(tài)下的量子多體相互作用等基本問(wèn)題，從而開(kāi)辟了磁學(xué)研究的一個(gè)新方向——飛秒磁學(xué)�；�于此，系統(tǒng)綜述了飛秒脈沖激光誘導(dǎo)超快自旋動(dòng)力學(xué)的發(fā)展歷程、實(shí)驗(yàn)裝置、理論和實(shí)驗(yàn)研究的重要進(jìn)展以及磁光領(lǐng)域的重要應(yīng)用——全光學(xué)磁矩翻轉(zhuǎn)效應(yīng)。通過(guò)系統(tǒng)綜述相關(guān)研究結(jié)果，發(fā)現(xiàn)要想更準(zhǔn)確、更深入地研究超快自旋動(dòng)力學(xué)的微觀機(jī)制，還需要建立超越唯象的研究模型，發(fā)展更直接的描述方法，從而尋找具有高熱穩(wěn)定性、高自旋極化率、低功耗和高速存儲(chǔ)等優(yōu)點(diǎn)的新材料，以期設(shè)計(jì)出具有超低能耗、超快響應(yīng)的新型自旋電子學(xué)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.