Observation of Coherent Gapless Magnons in an Antiferromagnet
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.
Authors
- Jilei Chen (ORCID: https://orcid.org/0000-0001-9619-8514)
- Lutong Sheng (ORCID: https://orcid.org/0000-0002-7610-8611)
- Haiming Yu (ORCID: https://orcid.org/0000-0002-3291-6713)
- Peng Yan (ORCID: https://orcid.org/0000-0001-6369-2882)
- Weiwei Wei (ORCID: https://orcid.org/0000-0003-4819-5356)
- Rundong Yuan (ORCID: https://orcid.org/0000-0002-8369-484X)
- Jean‐Philippe Ansermet (ORCID: https://orcid.org/0000-0002-1307-4864)
- Zhejunyu Jin
- Jinlong Wang (ORCID: https://orcid.org/0000-0002-5807-9095)
- Song Liu (ORCID: https://orcid.org/0000-0002-4063-0205)
- Yuelin Zhang (ORCID: https://orcid.org/0000-0001-8969-3082)
- Hanchen Wang (ORCID: https://orcid.org/0000-0001-5646-0493)
- Dapeng Yu (ORCID: https://orcid.org/0000-0002-0672-8233)
- Hao Jia (ORCID: https://orcid.org/0000-0002-6973-0197)
Institutions
- University of Electronic Science and Technology of China (CN)
- University of Cambridge (GB)
- Beijing Normal University (CN)
- Southern University of Science and Technology (CN)
- ETH Zurich (CH)
- Quantum (Australia) (AU)
- National Engineering Research Center of Electromagnetic Radiation Control Materials (CN)
- Beijing Academy of Quantum Information Sciences (CN)
- École Polytechnique Fédérale de Lausanne (CH)
- Beihang University (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-02-06
- DOI
- https://doi.org/10.1103/physrevlett.134.056701
- Citations
- 9
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 11.22
Funders
- National Science Foundation
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Cambridge Trust
- China Scholarship Council
- National Key Research and Development Program of China
- Basic and Applied Basic Research Foundation of Guangdong Province