Spin-wave intermodal coupling in the interconnection of magnonic units

Abstract

We report experimental investigation of spin-wave transport along combined magnonic structures which are comprised of the 90°-magnonic bend and adjacent nonidentical magnetic stripes. The latter has the form of a spin-wave coupler. Using space-resolved Brillouin light-scattering spectroscopy and micromagnetic simulations, we study propagation, transformation, and coupling of spin waves in the combined structure. We show that characteristics of spin-wave transport in such structures are defined strongly by the intermodal dipolar spin-wave coupling. The developed structure can operate as a multifunctional magnonic device and can be used to turn the spin wave at 90° performing the functionality of a directional coupler, a power splitter, a multiplexer, or a frequency separator. Our results show that interconnection of magnonic units can be utilized for further development of planar topologies of insulator-based magnonic networks.