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Title: Study of photon–magnon coupling in a YIG-film split-ring resonant system

By using the stripline Microwave Vector–Network Analyser Ferromagnetic Resonance and Time Domain spectroscopy techniques, we study a strong coupling regime of magnons to microwave photons in the planar geometry of a lithographically formed split-ring resonator (SRR) loaded by a single-crystal epitaxial yttrium–iron–garnet (YIG) film. Strong anti-crossing of the photon modes of SRR and of the magnon modes of the YIG film is observed in the applied-magnetic-field resolved measurements. The coupling strength extracted from the experimental data reaches 9% at 3 GHz. Theoretically, we propose an equivalent circuit model of the SRR loaded by a magnetic film. This model follows from the results of our numerical simulations of the microwave field structure of the SRR and of the magnetisation dynamics in the YIG film driven by the microwave currents in the SRR. The results obtained with the equivalent-circuit model are in good agreement with the experiment. This model provides a simple physical explanation of the process of mode anti-crossing. Our findings are important for future applications in microwave quantum photonic devices as well as in nonlinear and magnetically tuneable metamaterials exploiting the strong coupling of magnons to microwave photons.
Authors:
;  [1] ;  [2] ; ; ;  [3] ;  [4] ;  [1] ;  [3] ;  [5]
  1. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India)
  2. (India)
  3. School of Physics M013, University of Western Australia, Crawley 6009 (Australia)
  4. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076 (India)
  5. (United Kingdom)
Publication Date:
OSTI Identifier:
22399157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; COUPLING; EPITAXY; EQUIVALENT CIRCUITS; FERRITE GARNETS; FERROMAGNETIC RESONANCE; GARNETS; GHZ RANGE; IRON OXIDES; MAGNETIC FIELDS; MAGNETIZATION; MAGNONS; METAMATERIALS; MICROWAVE RADIATION; MONOCRYSTALS; PHOTONS; SPLIT-RING RESONATORS; THIN FILMS; YTTRIUM COMPOUNDS