In this paper, we propose an approach to controlling spin wave propagation in hybrid polymer 3D structures by depositing magnetite nanoparticles on the surface of an yttrium iron garnet waveguide. Spin wave propagation was studied using microscopic Mandelstam–Brillouin spectroscopy. It is shown that changing the direction of the external magnetic field leads to a redistribution of the magnetic moment of the nanoparticles, which, in turn, modulates the local demagnetizing field in the YIG film. This effect is visualized using spatial maps of the MBS intensity distribution. The results of micromagnetic simulations are in good agreement with experimental data and explain the mechanism for controlling spin-wave transport: local disturbances created by the nanoparticles form an inhomogeneity in the film’s internal magnetic field, enabling effective control of spin wave propagation. Convergence between simulation and experiment was achieved by taking into account the actual geometric and magnetic parameters of the system and within the framework of standard spin wave theory. This system opens the possibility of creating adaptive, highly sensitive biomedical sensors with feedback, as well as the possibility of developing elements for magnonic logic and information processing based on spin waves.
Garanin et al. (Wed,) studied this question.