BLS investigation of multi-layer magnetic structure
The present work is devoted to the development of the ideas of the directed branching of SW in 3D structures that is a three-dimensional magnonic network formed by a tangentially magnetized magnonic-crystal structure, which is a layer of yttrium iron garnet films located one above the other with a lateral system of spin-waveguide channels separated by a two-dimensional array of grooves on the surface.
Using the Mandelstam-Brillouin spectroscopy method  with layer-by-layer visualization of the stationary spatial distribution of dynamic magnetization, the possibility of transferring the angular momentum in the lateral and vertical directions and spatial-frequency selection of the spin-wave signal has been demonstrated.
The features of the formation of collimated beams of spin waves  on the basis of the obtained dispersion characteristics and mode decomposition of the signal propagating at the frequencies of the bandgap of the magnonic crystal structure have been revealed by the finite element method and by means of micromagnetic modeling.
The results of numerical modeling and experimental research are in good agreement with each other. It is shown that the revealed method of spin-wave transport control can find application in the creation of elements of fuzzy systems based on the principles of spatial-frequency selection of a microwave signal in three-dimensional topologies of magnon networks.
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Saratov State University
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