Tunable spin-wave nonreciprocity in ferrimagnetic domain-wall channels

Abstract: 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 spin-wave nonreciprocity in ferrimagnetic domain-wall channels under the influence of an external field. It is revealed that the Dzyaloshinskii-Moriya interaction (DMI) exerts dual control over both nonreciprocal spin-wave 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 stabilize or destabilize the domain wall structure, offering precise control over spin-wave nonreciprocity. Ultimately, we demonstrate a controllable SW transmission scheme via external magnetic field modulation, providing critical insights for the design of future magnonic devices.