Control of Spin Wave Propagation in the System of Laterally and Vertically Coupled Ferimagnetic Stripes by the Varying of the Equilibrium of Magnetization Direction

Abstract

Here we present the results of the study of the joint manifestation of the effects of anisotropic spin waves (SW) propagation in a system of laterally and vertically coupled ferrimagnetic microwaveguides when both the magnetization angle and air gap between waveguide are changed. The micromagnetic modeling method based on the numerical solution of the Landau–Lifshitz–Hilbert equation was used to provide the possibility of controlling the direction of SW propagation in a system of laterally and vertically coupled iron-yttrium garnet (YIG) microwaveguides by changing the magnetization angle and direction of the equilibrium of magnetization direction. The spatial distributions of the dynamic magnetization out-of-plane component of the SW excited in two microwaveguides located on the same substrate obtained in micromagnetic simulations indicate a change in the nature of the SW power localization in the output sections of the microwaveguides. The variation of the magnetization angle of the array leads to the variation of the transverse width of the spin-wave beam and localization of the amplitude maximum in each of the microwaveguides within the array. The joint manifestation of dipole coupling effects in each separately taken layer of the structure realizes the regime of non-diffraction propagation of the spin-wave beam.