Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co_(2)FeAl film epitaxied on GaAs

作     者：Lin Song Wei Yan Hailong Wang Jianhua Zhao Xinhui Zhang Lin Song;Wei Yan;Hailong Wang;Jianhua Zhao;Xinhui Zhang

作者机构：State Key Laboratory of Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Laser InstituteQilu University of Technology(Shandong Academy of Sciences)Qingdao 266000China 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2021年第42卷第3期

页      面：66-72页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This work was supported by the National Key R&D Program of China(No.2017YFB0405700) National Natural Science Foundation of China(No.12074370) 

主　　题：magnetic damping coherent longitudinal acoustic phonons magnetoelastic effect long-range spin manipulation 

摘      要：The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external *** intrinsic magnetic damping constant,which should do not vary with the external magnetic field,exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co_(2)FeAl/GaAs *** experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition,which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co_(2)*** experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect,suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.