Control of Resonance Properties in a "Microwave Waveguide – Ring Resonator" System Based on Yttrium Iron Garnet Films

Abstract

In this work, the propagation of spin waves in an integrated structure based on a low-damping epitaxial yttrium iron garnet (YIG) film containing a square ring resonator and a microwave waveguide is investigated using micromagnetic simulations (MuMax3). A detailed comparative analysis of two coupling topologies is performed: with continuous magnetic contact and with a controlled non-magnetic gap of 10 μm. It is shown that varying the external magnetic field orientation induces pronounced spatial inhomogeneity of the effective magnetic field due to the geometric anisotropy of the square contour. This leads to a controlled shift of resonance frequencies while maintaining a high quality factor and frequency selectivity of the structure. Analysis of dynamic magnetization maps demonstrates a transition from symmetric azimuthal modes to mixed modes, accompanied by characteristic interference patterns and caustic-like ray structures arising from the anisotropic dispersion of dipolar spin waves. The angular tuning mechanism is common to both configurations; however, the gap introduces evanescent coupling, modifying the transmitted signal amplitude and adding phase delay due to field leakage. The obtained results demonstrate flexible control over frequency selectivity and signal transmission efficiency by varying the coupling topology and field orientation without altering the device geometry. The proposed structures hold high potential as compact tunable magnonic filters and routing nodes in prospective 3D magnonic circuits.

Speaker

N.Yu.Yasnev
Saratov State University
Russia

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