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From the same journal

Strain-Controlled Spin Wave Excitation and Gilbert Damping in Flexible Co2FeSi Films Activated by Femtosecond Laser Pulse

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  • 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


Publication details

DateAccepted/In press - 12 Jan 2021
DateE-pub ahead of print - 15 Jan 2021
DatePublished (current) - 24 Mar 2021
Issue number13
Early online date15/01/21
Original languageEnglish


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.

Bibliographical note

Funding Information:
Z.Z., E.L., X.L., and W.Z. contributed equally to this work. This work was sponsored by the National Natural Science Foundation of China (51601093, 11974184, 11604148, and 61427812), the Fundamental Research Funds for the Central Universities (30916011345), the Key Research and Development Program of Jiangsu Province (BE2017102), and the Special Fund for the Transformation of Scientific and Technological Achievements in Jiangsu Province (BA2017121). W.Z. and P.K.J.W. are supported by the Fundamental Research Funds for the Central Universities. W.Z., P.K.J.W., and A.T.S.W. acknowledge the financial support from the Singapore Ministry of Education Tier 2 Grant (MOE2016‐T2‐2‐110). The authors would like to acknowledge the Singapore Synchrotron Light Source (SSLS) for providing the facility necessary for conducting the research. The Laboratory is a National Research Infrastructure under the National Research Foundation Singapore.

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    Research areas

  • Gilbert damping, spin waves, strain engineering, ultrafast optics, X-ray magnetic circular dichroism

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