Enhanced Magnon-Photon Coupling at the Angular Momentum Compensation Point of Ferrimagnets

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We theoretically show that the coupling between magnons in an antiferromagnetically coupled ferrimagnet and microwave photons in a cavity is largely enhanced at the angular momentum compensation point (T-A) when T-A is distinct from the magnetization compensation point. The origin of the enhanced magnon-photon coupling at T-A is identified as the antiferromagnetic spin dynamics combined with a finite magnetization. Moreover, we show that strong magnon-photon coupling can be achieved at high excitation frequency in a ferrimagnet, which is challenging to achieve for a ferromagnet due to low magnon frequency and for an antiferromagnet due to weak magnon-photon coupling. Our results will invigorate research on magnon-photon coupling by proposing ferrimagnets as a versatile platform that offers advantages of both ferromagnets and antiferromagnets.
Publisher
AMER PHYSICAL SOC
Issue Date
2020-07
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.125, no.2, pp.027205

ISSN
0031-9007
DOI
10.1103/PhysRevLett.125.027205
URI
http://hdl.handle.net/10203/275648
Appears in Collection
PH-Journal Papers(저널논문)
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