Enhanced Magnon-Photon Coupling at the Angular Momentum Compensation Point of Ferrimagnets.
PHYSICAL REVIEW LETTERS(2020)
摘要
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.
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