Microwave Transmission Theory for On-Chip Ultrastrong-Coupled Magnon-Polariton in Dynamical Inductors

Takahiro Chiba, Takashi Komine, Tomosuke Aono

Research output: Contribution to journalArticlepeer-review


We present a microwave transmission theory for recently proposed ultrastrong-coupled magnon-polariton (MP) in dynamical inductors which consist of a coil involving a magnetic insulator. Combining with the RLC-circuit and Landau-Lifshitz-Gilbert equations, we formulate the electric impedance of MP as a coupled oscillator under the corresponding principle. Based on the transmission (ABCD or F) matrix approach, we further calculate S21 being a scattering parameter for the microwave transmission measurement passing through an RLC-circuit with the dynamical inductor. By tunning the size of the dynamical inductor, we theoretically demonstrate an on-chip ultrastrong-coupled MP at room temperature, which reaches a coupling ratio about 0.55 and cooperativity about 2×105 with material parameters of Y3Fe5O12. This work paves the way for quasi-two-dimensional circuit/wave-guide based magnonics for quantum information technology.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalJournal of the Magnetics Society of Japan
Issue number2
Publication statusPublished - 2024


  • ferromagnetic resonance
  • hybrid quantum systems
  • magnetic insulators
  • magnons
  • microwave techniques
  • polaritons
  • quantum information technology


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