Programmable Hybrid Magnonic Waveguides for Spin-Wave Filtering and 90° Redirection.

Abstract

Active control of low-loss spin-wave propagation at the nanoscale is crucial for energy-efficient magnonic computing. Here, we demonstrate the precise manipulation of spin-wave transport in hybrid waveguides, comprising continuous YIG films overlaid with patterned ferromagnetic metal nanostripes. Our designs enable field-tunable filtering, controllable splitting, and selective 90° redirection of spin waves. Using super-Nyquist sampling magneto-optical Kerr effect (SNS-MOKE) microscopy, corroborated by micromagnetic simulations, we show that spin-wave pathways can be programmed via engineered magnetic field landscapes in the YIG film. Moreover, aligning the magnetization to the diagonal of a cross-shaped waveguide network results in multiple 90° spin-wave redirections with low loss on the nanoscale. This versatile and straightforward approach provides a scalable route to compact, coherent, and reconfigurable magnonic networks, paving the way for integrated wave-based information processing.