Interaction of spin waves propagating along narrow domain walls with a magnetic vortex in a thin-film-nanostrip cross-structure

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We studied, by micromagnetic simulations, the characteristic propagation behaviors of specific spin-wave modes along narrow domain walls in a specially designed thin-film-nanostrip cross-structure waveguide as well as their novel interaction behaviors with a single magnetic vortex placed at the cross-point. Only certain specific modes of spin waves well propagate along the given domain walls and then interact with the magnetic vortex. Through this robust interaction, vortex-gyration motions are also stimulated, which exhibit circular- and/or elliptical-shape core trajectories at the same frequencies as those of the pumping spin waves. The elliptical core trajectories of the stimulated vortex gyrations can be interpreted by the superposition of different amplitudes and phases of the clockwise and counterclockwise circular eigenmodes. According to the action–reaction effect, the phase and the amplitude of the propagating spin waves that pass through the vortex structure are modified differently into different arms of the nanostrip cross-structure. Thereby, the propagating spin waves are allowed to be transmitted and scattered with contrasting phases and amplitudes in different branch arms. This work provides a fundamental understanding of the interaction of spin waves propagating along domain walls with a magnetic soliton and also suggests potential applications to magnonic information processing devices.