Space-resolved Brillouin light-scattering spectroscopy and micromagnetic simulations are used to study the propagation of magnetostatic spin waves across nonidentical magnonic crystals within close proximity. We show that the characteristics of spin-wave modes in such structure depends on the geometry of adjacent magnonic crystals. In particular, our results demonstrate that the efficient spin-wave coupling at the frequency of the magnonic forbidden gap can be achieved, enabling the spin-wave power drop between asymmetric magnonic crystals. We demonstrate, that the combination of spatial-filtering features and the spin-wave coupling in the adjacent magnonic crystals leads to the realization of the frequency-selective magnonic drop filter which is expected to offer new functionalities for spin-wave demultiplexing applications within the complex magnonic circuitry.

• Received 9 January 2018

DOI:https://doi.org/10.1103/PhysRevApplied.9.051002