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arXiv · 2307.04135

Dzyaloshinskii-Moriya torque-driven resonance in antiferromagnetic {\alpha}-Fe2O3

Qiyao Liu·Taeheon Kim·Kyusup Lee·Dongsheng Yang·Dushyant Kumar·Fanrui Hu·Hyunsoo Yang
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Abstract

We examine the high-frequency optical mode of {\alpha}-Fe2O3 and report that Dzyaloshinskii-Moriya (DM) interaction generates a new type of torque on the magnetic resonance. Using a continuous-wave terahertz interferometer, we measure the optical mode spectra, where the asymmetric absorption with a large amplitude and broad linewidth is observed near the magnetic transition point, Morin temperature (TM ~ 254.3 K). Based on the spin wave model, the spectral anomaly is attributed to the DM interaction-induced torque, enabling to extract the strength of DM interaction field of 4 T. Our work opens a new avenue to characterize the spin resonance behaviors at an antiferromagnetic singular point for next-generation and high-frequency spin-based information technologies.

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Qiyao Liu, Taeheon Kim, Kyusup Lee, Dongsheng Yang, Dushyant Kumar, Fanrui Hu, Hyunsoo Yang. 2023-07-09. Dzyaloshinskii-Moriya torque-driven resonance in antiferromagnetic {\alpha}-Fe2O3. https://arxiv.org/abs/2307.04135

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