Nonreciprocal Spin Waves in Out‐of‐Plane Magnetized Coupled Waveguides Reconfigured by Domain Wall Displacements

Wave‐based platforms for unconventional computing require a controlled yet adjustable flow of wave information, integrated with non‐volatile data storage. Spin waves are ideal for such platforms due to their inherent nonreciprocal properties and direct interaction with magnetic storage. This study demonstrates how spin‐wave nonreciprocity, induced by dipolar interactions in nanowaveguides with antiparallel out‐of‐plane magnetization, enables the realization of a spin‐wave circulator for unidirectional signal transport and advanced routing. The device's functionality can be continuously reconfigured using a magnetic domain wall with adjustable position, offering non‐volatile control over output and nonreciprocity. These features are illustrated using a spin‐wave directional coupler, validated through micromagnetic simulations and analytical models, which also support the functions of a waveguide crossing, tunable power splitter, and frequency multiplexer. The proposed domain‐wall‐based reconfiguration, combined with nonlinear spin‐wave behavior, holds promise for developing a nanoscale, nonlinear wave computing platform with self‐learning capabilities.