Terahertz Magnon-Polaritons in TmFeO3

Grishunin, Kirill and Huisman, Thomas J. and Li, Guanqiao and Mishina, Elena and Rasing, Theo and Kimel, Alexey V. and Zhang, Kailing and Jin, Zuanming and Cao, Shixun and Ren, Wei and Ma, Guo-Hong and Mikhaylovskiy, Rostislav (2018) Terahertz Magnon-Polaritons in TmFeO3. ACS Photonics, 5 (4). pp. 1375-1380. ISSN 2330-4022

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Magnon-polaritons are shown to play a dominant role in the propagation of terahertz (THz) waves through TmFeO3 orthoferrite, if the frequencies of the waves are in the vicinity of the quasi-antiferromagnetic spin resonance mode. Both time-domain THz transmission and emission spectroscopies reveal clear beatings between two modes with frequencies slightly above and slightly below this resonance, respectively. Rigorous modeling of the interaction between the spins of TmFeO3 and the THz light shows that the frequencies correspond to the upper and lower magnon-polariton branches. Our findings reveal the previously ignored importance of propagation effects and polaritons in such heavily debated areas as THz magnonics and THz spectroscopy of electromagnons. It also shows that future progress in these areas calls for an interdisciplinary approach at the interface between magnetism and photonics.

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Journal Article
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ACS Photonics
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Deposited On:
14 Mar 2019 13:20
Last Modified:
22 Nov 2022 07:11