Abstract:
The modes of unidirectional propagation of spin waves (SW) in a tangentially magnetized and transversely confined microwave formed from two layers of yttrium-iron garnet (YIG) with different magnitudes of saturation magnetizations inside each layer are demonstrated. The micromagnetic modeling method based on the numerical solution of the Landau–Lifshitz–Gilbert equation was used to study the modes of propagation of the SW when dissipation in the structure is taken into account. On the basis of the construction of transmission spectra and dispersion characteristics of SW, a two-frequency unidirectional mode of SW propagation is investigated; the accompanying effect is a significant manifestation of the properties of nonreciprocity of surface SW. For inverse bulk SW, hybridization of high-frequency and low-frequency modes is found, manifesting itself in the dispersion characteristics mellowing. The unidirectional nonreciprocal mode of multimode propagation of SW in bilayer microwaves of finite width can be used to realize spintronics and magnonics devices, e. g., spin diodes and functional multiband interconnect elements in integrated topologies of magnon networks.
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