Enhanced Magnon-Photon Coupling at the Angular Momentum Compensation Point of Ferrimagnets
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 magn...
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| Veröffentlicht in: | Physical review letters 2020-07, Vol.125 (2), p.1-027205, Article 027205 |
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| container_title | Physical review letters |
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| creator | Shim, Jaechul Kim, Seok-Jong Kim, Se Kwon Lee, Kyung-Jin |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevLett.125.027205 |
| format | Article |
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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. 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| source | American Physical Society Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Angular momentum Antiferromagnetism Compensation Coupling Ferrimagnetism Ferrimagnets Ferromagnetism Magnetization Magnons Photons Spin dynamics |
| title | Enhanced Magnon-Photon Coupling at the Angular Momentum Compensation Point of Ferrimagnets |
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