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

Jaechul Shim, Seok Jong Kim, Se Kwon Kim, Kyung Jin Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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 (TA) when TA is distinct from the magnetization compensation point. The origin of the enhanced magnon-photon coupling at TA 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.

Original languageEnglish
Article number027205
JournalPhysical review letters
Volume125
Issue number2
DOIs
Publication statusPublished - 2020 Jul 10

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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