• DOI:10.1103/PhysRevMaterials.2.051401
• Corpus ID: 118891189

Tuning the diffusion of magnon in Y3Fe5O12 by light excitation

@inproceedings{Wang2017TuningTD,
  title={Tuning the diffusion of magnon in Y3Fe5O12 by light excitation},
  author={Shuanhu Wang and Gang Li and E. J. Guo and Yang Zhao and Jianyuan Wang and Lvkuan Zou and Hong Yan and Jian Wang Cai and Zhaoting Zhang and Min Wang and Yingyi Tian and Xiaoli Zheng and Jirong Sun and Kexin Jin},
  year={2017}
}

• Shuanhu Wang, Gang Li, +11 authors K. Jin
• Published 30 September 2017
• Physics

Deliberate control of magnon transportation will lead to an energy-efficient technology for information transmission and processing. Y 3 Fe 5 O 12 (YIG), exhibiting extremely large magnon diffusion length due to the low magnetic damping constant, has been intensively investigated for decades. While most of the previous works focused on the determination of magnon diffusion length by various techniques, herein we demonstrated how to tune magnon diffusion by light excitation. We found that the diffusion length of thermal magnons is strongly dependent on light wavelength when the magnon is generated by exposing YIG directly to laser beam. The diffusion length, determined by a nonlocal geometry at room temperature, is ~30  m for the magnons produced by visible light (400-650 nm), and ~136-156  m for the laser between 808 nm and 980 nm. The diffusion distance is much longer than the reported value. In addition to thermal gradient, we found that light illumination affected the electron configuration of the Fe 3+ ion in YIG. Long wavelength laser triggers a high spin to low spin state transition of the Fe 3+ ions in FeO 6 octahedron. This in turn causes a substantial softening of the magnon thus a dramatic increase in diffusion distance. The present work