We theoretically study a magnon–polariton in a dynamical inductor consisting of a coil and a bilayer of ferromagnetic insulator (FI) with perpendicular magnetization and a three-dimensional topological insulator (TI). Taking into account the coherent magnetic-dipole (Zeeman) interaction as well as the dissipative spin pumping effect on the FI/TI interface, we formulate a dynamical permeability of the FI/TI bilayer and calculate a corresponding electric admittance of an RLC-circuit. As a result, the spin pumping gives rise to a competitive effect on the modes hybridization, whereas a huge level repulsion due to the coherent coupling, which reaches the ultrastrong coupling regime, is found at room temperature for realistic parameter sets. Our work may open a new avenue for designing on-chip microwave devices based on a magnon–polariton in the RLC-circuit.
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1 January 2024
Research Article|
January 02 2024
Ultrastrong-coupled magnon–polariton in a dynamical inductor based on magnetic-insulator/topological-insulator bilayers Available to Purchase
Special Collection:
Magnonics
Takahiro Chiba
;
Takahiro Chiba
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Project administration, Writing – original draft, Writing – review & editing)
1
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University
, Sendai, Miyagi 980-8578, Japan
2
Department of Applied Physics, Graduate School of Engineering, Tohoku University
, Sendai, Miyagi 980-8579, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Takashi Komine
;
Takashi Komine
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Writing – original draft, Writing – review & editing)
3
Graduate School of Science and Engineering, Ibaraki University
, 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
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Tomosuke Aono
Tomosuke Aono
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Writing – original draft, Writing – review & editing)
3
Graduate School of Science and Engineering, Ibaraki University
, 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
Search for other works by this author on:
Takahiro Chiba
1,2,a)
Takashi Komine
3
Tomosuke Aono
3
1
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University
, Sendai, Miyagi 980-8578, Japan
2
Department of Applied Physics, Graduate School of Engineering, Tohoku University
, Sendai, Miyagi 980-8579, Japan
3
Graduate School of Science and Engineering, Ibaraki University
, 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 124, 012402 (2024)
Article history
Received:
August 25 2023
Accepted:
December 17 2023
Citation
Takahiro Chiba, Takashi Komine, Tomosuke Aono; Ultrastrong-coupled magnon–polariton in a dynamical inductor based on magnetic-insulator/topological-insulator bilayers. Appl. Phys. Lett. 1 January 2024; 124 (1): 012402. https://doi.org/10.1063/5.0173898
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