Antiferromagnetic bimeron dynamics controlled by magnetic defects

Abstract

We investigate dynamics of an isolated bimeron in the antiferromagnetic system, in the presence of magnetic defects. The bimeron is driven by torques due to a spin-polarized current, which is incorporated into the Landau–Lifshitz–Gilbert (LLG) equation. We numerically solve the LLG equation, and find a breathing dynamics of the bimeron as well as its transverse motion owing to the defect potential. We also analyze the potential landscapes due to the interaction between the bimeron and a defect, and give a qualitative picture of the numerically obtained dynamics.