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Magnetic bimerons are topologically nontrivial spin textures in in-planeeasy-axis magnets, which can be used as particle-like information carriers.Here, we report a theoretical study on the nonreciprocal dynamics ofasymmetrical ferrimagnetic (FiM) bimerons induced by spin currents. The FiMbimerons have the ability to move at a speed of kilometers per second and donot show the skyrmion Hall effect at the angular momentum compensation point.Our micromagnetic simulations and analytical results demonstrate that spincurrents are able to induce the nonreciprocal transport and a drift motion ofthe FiM bimeron even if the system is at the angular momentum compensationpoint. By analyzing the current-induced effective fields, we find that thenonreciprocal transport is attributed to the asymmetry of the bimeronstructure. Our results are useful for understanding the physics of bimerons inferrimagnets and may provide guidelines for building bimeron-based spintronicdevices.

Nonreciprocal dynamics of ferrimagnetic bimerons