Modification of the Dispersion Spectrum of Surface Spin Waves in Bilayer YIG Films by a Hybrid Magnonic Crystal
Ptashenko A. S.
1, Sadovnikov A.V.
1
1Saratov State University, Saratov, Russia
Email: andrey.po3@mail.ru
In this work, numerical modeling is employed to investigate the physical mechanisms of interaction between surface magnetostatic waves and a conducting medium in a hybrid structure composed of a bilayer iron-yttrium garnet (YIG) film and a metallic magnonic crystal. The study focuses on analyzing the transformation of the dispersion spectrum of surface magnetostatic waves as a function of the metal's electrical conductivity and its spatial position relative to the ferromagnetic layers. The underlying physical mechanism is the excitation of eddy currents in the metallic screen by the time-varying magnetic field of the spin wave. These currents generate a secondary magnetic field that modifies the dipolar field of the wave, thereby altering its dispersion characteristics. It is demonstrated that reducing the metal's conductivity weakens the screening effect, manifesting in the smoothing of anti-crossings between dispersion modes and a narrowing of Bragg bandgaps. A threshold behavior of conductivity is identified: below this threshold, the system behaves virtually as an unshielded bilayer YIG film. The effect is shown to be strongly dependent on the screen's position, which is attributed to the differing spatial overlap between the localized surface magnetostatic wave fields (at opposite interfaces) and the regions of induced eddy currents. These findings contribute to the fundamental understanding of spin-wave electrodynamics in ferromagnet-metal hybrid structures. Keywords: magnonics; spin waves; hybrid magnonic systems; yttrium iron garnet; magnonic crystal; eddy currents; dipole-dipole interaction; nonreciprocity.
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