Gigahertz Frequency Antiferromagnetic Resonance and Strong Magnon-Magnon Coupling in the Layered Crystal CrCl 3
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© 2019 American Physical Society. We report broadband microwave absorption spectroscopy of the layered antiferromagnet CrCl3. We observe a rich structure of resonances arising from quasi-two-dimensional antiferromagnetic dynamics. Because of the weak interlayer magnetic coupling in this material, we are able to observe both optical and acoustic branches of antiferromagnetic resonance in the GHz frequency range and a symmetry-protected crossing between them. By breaking rotational symmetry, we further show that strong magnon-magnon coupling with large tunable gaps can be induced between the two resonant modes.
Date issued
2019-07Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer ScienceJournal
Physical Review Letters
Publisher
American Physical Society (APS)
ISSN
0031-9007
1079-7114