Nonlinear system of cavity magnonics based on an yttrium iron garnet superthin film

S. V. Grishin

Saratov State University

Abstract: The paper presents the results of an experimental study of a system “a microstrip half-wave resonator (MSHWR) and a superthin yttrium iron garnet (YIG) film” at the higher power levels. It is shown that in the linear mode the superthin YIG film located in the alternating current antinode of the MSHWR fundamental mode operates as a gyromagnetic resonator (GMR) at the ferromagnetic resonance (FMR) frequency. The latter is determined by the transverse orientation of the external static magnetic field relative to the distribution of the alternating current of the standing wave in the MSHWR. It is established that if the MSHWR is replaced by a microstrip transmission line operating in the traveling wave mode, then the superthin YIG film does not act as the GMR at the same orientation of the static magnetic field relative to the microstrip conductor. In the nonlinear mode, the “MSHWR – superthin YIG film” system is a multifunctional nonlinear device with lower power thresholds than in the case of micron-thick YIG films.

Keywords: cavity magnonics, superthin yig films, nonlinear ferromagnetic resonance.

Received: 28.04.2025
Revised: 16.09.2025
Accepted: 17.09.2025

DOI: 10.61011/PJTF.2026.02.62070.20362

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