Antiferromagnetic resonance in $\alpha$-MnTe
J. Dzian, P. Kuba\v{s}\v{c}\'ik, S. T\'azlar\r{u}, M. Bia{\l}ek, M. \v{S}indler, F. Le Mardel\'e, C. Kadlec, F. Kadlec, M. Gryglas-Borysiewicz, K. P. Kluczyk, A. Mycielski, P. Skupi\'nski, J. Hejtm\'anek, R. Tesa\v{r}, J. \v{Z}elezn\'y, A.-L. Barra, C. Faugeras, J. Voln\'y
TL;DR
This study investigates antiferromagnetic resonance in bulk $ extalpha$-MnTe using THz spectroscopy, identifying magnon modes and extracting magnetic anisotropy parameters through experimental and modeling approaches.
Contribution
It provides the first detailed experimental analysis of antiferromagnetic resonance in $ extalpha$-MnTe and derives magnetic anisotropy constants using combined spectroscopy and modeling.
Findings
Identified magnon mode at 3.5 meV in $ extalpha$-MnTe.
Extracted out-of-plane magnetic anisotropy of 40 μeV.
Validated a simplified model for antiferromagnetic resonance.
Abstract
Antiferromagnetic resonance in a bulk -MnTe crystal is investigated using both frequency-domain and time-domain THz spectroscopy techniques. At low temperatures, an excitation at the photon energy of ~meV is observed and identified as a magnon mode through its distinctive dependence on temperature and magnetic field. This behavior is reproduced using a simplified model for antiferromagnetic resonance in an easy-plane antiferromagnet. The results of our experiments, when compared to exchange constants established in the literature, allow us to extract the out-of-plane component of the single-ion magnetic anisotropy reaching ~eV.
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