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Title: Rigorous numerical study of strong microwave photon-magnon coupling in all-dielectric magnetic multilayers

We demonstrate theoretically a ∼350-fold local enhancement of the intensity of the in-plane microwave magnetic field in multilayered structures made from a magneto-insulating yttrium iron garnet (YIG) layer sandwiched between two non-magnetic layers with a high dielectric constant matching that of YIG. The enhancement is predicted for the excitation regime when the microwave magnetic field is induced inside the multilayer by the transducer of a stripline Broadband Ferromagnetic Resonance (BFMR) setup. By means of a rigorous numerical solution of the Landau-Lifshitz-Gilbert equation consistently with the Maxwell's equations, we investigate the magnetisation dynamics in the multilayer. We reveal a strong photon-magnon coupling, which manifests itself as anti-crossing of the ferromagnetic resonance magnon mode supported by the YIG layer and the electromagnetic resonance mode supported by the whole multilayered structure. The frequency of the magnon mode depends on the external static magnetic field, which in our case is applied tangentially to the multilayer in the direction perpendicular to the microwave magnetic field induced by the stripline of the BFMR setup. The frequency of the electromagnetic mode is independent of the static magnetic field. Consequently, the predicted photon-magnon coupling is sensitive to the applied magnetic field and thus can be used in magneticallymore » tuneable metamaterials based on simultaneously negative permittivity and permeability achievable thanks to the YIG layer. We also suggest that the predicted photon-magnon coupling may find applications in microwave quantum information systems.« less
Authors:
 [1] ;  [2] ; ; ;  [1]
  1. School of Physics M013, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009 (Australia)
  2. (Australia)
Publication Date:
OSTI Identifier:
22410213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; DIELECTRIC MATERIALS; EXCITATION; FERRITE GARNETS; FERROMAGNETIC RESONANCE; IRON OXIDES; LAYERS; MAGNETIC FIELDS; MAGNETIZATION; MAGNONS; METAMATERIALS; MICROWAVE RADIATION; NUMERICAL ANALYSIS; NUMERICAL SOLUTION; PERMITTIVITY; PHOTONS; QUANTUM INFORMATION; TRANSDUCERS; YTTRIUM COMPOUNDS