Nonreciprocal dynamics of ferrimagnetic bimerons

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.

Automated summary

The study focuses on the nonreciprocal dynamics of asymmetrical ferrimagnetic bimerons induced by spin currents, showing that the bimerons can move at high speeds and do not exhibit the skyrmion Hall effect at the angular momentum compensation point. Analysis of the current-induced effective fields reveals that the nonreciprocal transport is due to the asymmetry of the bimeron structure. These findings enhance our understanding of bimerons in ferrimagnets and offer insights for potential applications in spintronic devices.