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Strain-Controlled Spin Wave Excitation and Gilbert Damping in Flexible Co2FeSi Films Activated by Femtosecond Laser Pulse |
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| Authors: | Zhi Zhang Er Liu Xianyang Lu Wen Zhang Yurong You Guizhou Xu Zhan Xu Ping Kwan Johnny Wong Yichuan Wang Bo Liu Xiaojiang Yu Jing Wu Yongbing Xu Andrew Thye Shen Wee Feng Xu |
| Affiliation: | 1. MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China;2. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093 China
York-Nanjing Joint Center (YNJC) for Spintronics and Nanoengineering, Department of Electronic Engineering, University of York, York, YO10 5DD UK;3. School of Electronics and Information, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, Shanxi, 710072 China;4. School of Electronics and Information, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, Shanxi, 710072 China Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542 Singapore Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore, 117546 Singapore;5. Department of Physics, University of York, York, YO10 5DD UK;6. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093 China;7. Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603 Singapore;8. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542 Singapore Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore, 117546 Singapore |
| Abstract: | The dynamic response of magnetic order to optical excitation at sub-picosecond scale has offered an intriguing alternative for magnetism manipulation. Such ultrafast optical manipulation of magnetism has become a fundamental challenging topic with high implications for future spintronics. Here, this study demonstrates such manipulation in Co2FeSi films grown on flexible polyimide substrate, and demonstrates how the magneto-optical interaction can be modified by using strain engineering which in turn triggers the excitation of both dipolar and exchange spin waves modes. Furthermore, Gilbert damping and spin-orbit coupling in Co2FeSi can both be tuned significantly by altering the magnitude and type of applied strain, suggesting an appealing way to manipulate spin wave propagation. These results develop the optical manipulation magnetism into the field of spin wave dynamics, and open a new direction in the application of spin orbitronics and magnonics devices using strain engineering. |
| Keywords: | Gilbert damping spin waves strain engineering ultrafast optics X-ray magnetic circular dichroism |