Tunable spin-wave nonreciprocity in ferrimagnetic domain-wall channels

The nonreciprocal propagation of spin waves (SWs) offers opportunities for developing novel functional magnonic logic devices, where controllability is crucial for magnetic-signal processing. Domain walls act as natural waveguides due to their magnetic configuration, offering a platform for the in-depth investigation of nonreciprocal SW propagation and its manipulation. In this work, we theoretically and numerically investigate the tunable SW nonreciprocity in ferrimagnetic domain-wall channels under the influence of external field. It is revealed that the Dzyaloshinskii-Moriya interaction exerts dual control over both nonreciprocal SW propagation and spin-splitting phenomena. Moreover, SW nonreciprocity is magnetically tunable, with its sign reversibly switched by inverting the applied field direction, while preserving the host-spin configuration. The orientation of the magnetic field can selectively modify the domain wall structure, offering precise control over SW nonreciprocity. Ultimately, we demonstrate a controllable SW transmission scheme via external magnetic-field modulation, providing critical insights for the design of future magnonic devices.