Análise da estabilidade de skyrmions em filme antiferromagnético (KMnF3/P t) contendo impurezas magnéticas

Abstract

Magnetic skyrmions had their theoretical forecast in 1989, being described as a quasiparticle that presents interesting properties, which make them promising for applications in spintronics. This is due to the fact that it isn’t easily annihilated by agitation, temperature variation, eletric field or external magnetic. Among the skyrmions, we have the antiferromagnetic skyrmions, which drafts because they don’t present a skyrmion Hall Effect in their movement and it’s possible to control their dynamics through a polarized spin current, where they reach high speeds without any deformation in their structure. Therefore, we performed micromagnetic computational simulations to investigate the behavior of an antiferromagnetic skyrmion stabilized in a bilayer formed by potassium manganese trifluoride material on platinum KMnF3/P t. The software used to obtain the results was developed by the research group itself. First, we study its stability and behavior, varying certain magnetic parameters of the material we focus on, in the following interactions: Dzyaloshinskii-Moriya (DM), stiffness exchange (A) and the saturation magnetization (MS). With the result of the simulations, a nanotracks was modeled where variation of its magnetic properties occurs locally, we also varied its area and investigated the response of the skyrmion to these modifications. In this way, we observe not only skyrmion fixation, but also dispersion for certain adjustments. Finally, we showed that the efficiency of a skyrmion trap is directly linked to the choice of magnetic defect properties and its area.