Surface Magnon Propagation in a van der Waals Antiferromagnet
The recently developed van der Waals magnets provide a promising platform for spintronics and magnonics. Here, we report the observation of surface magnon propagation in the van der Waals antiferromagnet CrSBr. We find a nearly unidirectional propagation of antiferromagnetic magnon modes, which emerge near the anticrossing of the optical and acoustic magnon bands, in agreement with our theory of magnetostatic waves in antiferromagnets. The propagation direction can be reversed by switching the magnetic field. The observed antiferromagnetic magnons operate in the gigahertz regime due to the weak interlayer exchange coupling. Our results open the pathway for nonreciprocal magnonic applications based on van der Waals antiferromagnets at easily accessible microwave frequencies.
Authors
- Dapeng Yu
- Kei Yamamoto (ORCID: https://orcid.org/0000-0001-9888-4796)
- Lutong Sheng (ORCID: https://orcid.org/0000-0002-7610-8611)
- Junfeng Hu (ORCID: https://orcid.org/0000-0002-2115-4661)
- Chenxu Kang
- Rundong Yuan (ORCID: https://orcid.org/0000-0002-8369-484X)
- Jean‐Philippe Ansermet (ORCID: https://orcid.org/0000-0002-1307-4864)
- Sadamichi Maekawa (ORCID: https://orcid.org/0000-0002-4237-7741)
- Jinlong Wang (ORCID: https://orcid.org/0000-0002-5807-9095)
- Song Liu
- Yujia Ceng
- Anonymous
- Chenyan Hu
- Kanglin Yu
Institutions
- Japan Atomic Energy Agency (JP)
- Shenzhen University (CN)
- University of Cambridge (GB)
- Southern University of Science and Technology (CN)
- Quantum (Australia) (AU)
- Kavli Institute for Theoretical Sciences (CN)
- RIKEN Center for Emergent Matter Science (JP)
- École Polytechnique Fédérale de Lausanne (CH)
- Beihang University (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2026-01-14
- DOI
- https://doi.org/10.1103/bkzn-qpqg
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 0.00