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Gigahertz frequency antiferromagnetic resonance and strong magnon-magnon coupling in the layered crystal CrCl3

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arxiv 1902.05669 v2 pith:MMCUDT5Y submitted 2019-02-15 cond-mat.mtrl-sci cond-mat.mes-hall

David MacNeill , Justin T. Hou , Dahlia R. Klein , Pengxiang Zhang , Pablo Jarillo-Herrero , Luqiao Liu This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.mes-hall
keywords antiferromagneticcouplingcrcl3frequencylayeredmagnon-magnonobserveresonance
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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. Due to 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.

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