  Magnetic bimerons are topologically nontrivial spin textures in in-plane
easy-axis magnets, which can be used as particle-like information carriers.
Here, we report a theoretical study on the nonreciprocal dynamics of
asymmetrical ferrimagnetic (FiM) bimerons induced by spin currents. The FiM
bimerons have the ability to move at a speed of kilometers per second and do
not show the skyrmion Hall effect at the angular momentum compensation point.
Our micromagnetic simulations and analytical results demonstrate that spin
currents are able to induce the nonreciprocal transport and a drift motion of
the FiM bimeron even if the system is at the angular momentum compensation
point. By analyzing the current-induced effective fields, we find that the
nonreciprocal transport is attributed to the asymmetry of the bimeron
structure. Our results are useful for understanding the physics of bimerons in
ferrimagnets and may provide guidelines for building bimeron-based spintronic
devices.
