Observation of Coherent Gapless Magnons in an Antiferromagnet.

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Tác giả: Jean-Philippe Ansermet, Jilei Chen, Hao Jia, Zhejunyu Jin, Song Liu, Lutong Sheng, Hanchen Wang, Jinlong Wang, Weiwei Wei, Peng Yan, Dapeng Yu, Haiming Yu, Rundong Yuan, Yuelin Zhang

Ngôn ngữ: eng

Ký hiệu phân loại: 231.765 Creation

Thông tin xuất bản: United States : Physical review letters , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 473998

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Antiferromagnetic magnons possess high speed and are immune to external disturbance, making them promising for future magnonic circuits. In this Letter, we report the observation of gapless magnons in an easy-axis antiferromagnet α-Fe_{2}O_{3} at low temperatures. These antiferromagnetic magnons are detected at nearly zero frequency by all-electrical spin-wave spectroscopy and propagate along antiferromagnetic domain walls as revealed by our theoretical model and simulations. Moreover, we demonstrate high coherency of these gapless magnons by showing their strong coupling with microwave photons. Our results open the pathway for antiferromagnetic texture based magnonic devices operating at microwave frequencies.

1. Observation
2. Of
3. Coherent

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