Antiferromagnetic-Bimeron dynamics driven by a spin-polarized current at an inhomogeneous racetrack

Abstract

Topological objects interacting with lattice defects are an essential topic in condensed matter physics. This work would like to explore how impurities influence the current-induced dynamics of antiferromagnetic Bimeron (AFM-Bimeron) moving in a racetrack. We investigate three classes of random defects: vacancies, the anisotropy at z-direction like magnetic impurities, and the exchange interaction like a magnetic defect. We have impelled AFM-Bimeron against the impurities region utilizing a spin-polarized current. If the AFM-Bimeron velocity (associated with the strength of the applied current) is high enough, it will pass through the region with the vacancies; else, the defects will destroy the texture. In magnetic impurities, the AFM-Bimeron will pass through the inhomogeneous region without problems, be destroyed, or be deformed, depending on the defects' magnetic parameters.