Ultrastrong-coupled magnon-polariton in a dynamical inductor based on magnetic-insulator/topological-insulator bilayers

Takahiro Chiba, Takashi Komine, Tomosuke Aono

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number012402
JournalApplied Physics Letters
Volume124
Issue number1
DOIs
Publication statusPublished - 2024 Jan 1

Fingerprint

Dive into the research topics of 'Ultrastrong-coupled magnon-polariton in a dynamical inductor based on magnetic-insulator/topological-insulator bilayers'. Together they form a unique fingerprint.

Cite this