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Observation of Ultrafast Magnon Dynamics in Antiferromagnetic Nickel Oxide by Optical Pump-Probe and Terahertz Time-Domain Spectroscopies

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Abstract

We have studied the ultrafast magnon dynamics in an antiferromagnetic 3d-transition-metal monoxide, nickel oxide (NiO), using optical pump-probe spectroscopy and terahertz time-domain spectroscopy (THz-TDS). THz damped magnon oscillations were observed in the Faraday rotation signal and in the transmitted THz electric field via optical pump-probe spectroscopy and THz-TDS, respectively. The magnon signals were observed in both the optical pump-probe spectroscopy and THz-TDS experiments, which shows that both Raman- and infrared-active modes are included in the NiO magnon modes. The magnon relaxation rate observed using THz-TDS was found to be almost constant up to the Néel temperature T N (= 523 K) and to increase abruptly near that temperature. This shows that temperature-independent spin-spin relaxation dominates up to T N . In our experiment, softening of the magnon frequency near T N was clearly observed. This result shows that the optical pump-probe spectroscopy and THz-TDS have high frequency resolution and a high signal to noise ratio in the THz region. We discuss the observed temperature dependence of the magnon frequencies using three different molecular field theories. The experimental results suggest that the biquadratic contribution of the exchange interaction plays an important role in the temperature dependence of the sublattice magnetization and the magnon frequency in cubic antiferromagnetic oxides.

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Authors and Affiliations

  1. Graduate School of Science, Kobe University, Kobe, 657-8501, Japan

    T. Kohmoto, S. Wakabayashi, H. Jinn, M. Takahara & K. Kakita

  2. Molecular Photoscience Research Center, Kobe University, Kobe, 657-8501, Japan

    T. Kohmoto

  3. Graduate School of Engineering, University of Fukui, Fukui, 910-8507, Japan

    T. Moriyasu

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  1. T. Kohmoto
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  2. T. Moriyasu
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Kohmoto, T., Moriyasu, T., Wakabayashi, S. et al. Observation of Ultrafast Magnon Dynamics in Antiferromagnetic Nickel Oxide by Optical Pump-Probe and Terahertz Time-Domain Spectroscopies. J Infrared Milli Terahz Waves 39, 77–92 (2018). https://doi.org/10.1007/s10762-017-0442-6

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