Bidirectional magnon-driven bimeron motion in ferromagnets

Abstract

As the in-plane magnetized counterparts of skyrmions in two dimensions, magnetic bimerons are swirling topological spin textures consisting of two merons. Here we theoretically and numerically investigate the dynamics of a bimeron induced by the monochromatic spin wave in a ferromagnetic thin film. The micromagnetic simulation results reveal that unlike the ferromagnetic skyrmion reported in previous studies, the bimeron can be pushed away from (or pulled towards) the wave source at the low (high) spin wave frequency. These numerical results are in line with the particle collision model formulating the interplay between the spin wave and magnetic bimeron. Our findings provide guidelines for constructing future bimeron-based spintronic devices with ultralow energy consumption.