Estudo via simulação computacional da estabilidade de Skyrmions em filmes antiferromagnéticos e suas interações com impurezas magnéticas

Abstract

Skyrmions are quasi-particles that have characteristics that make them viable for application in new generation memory and data processing devices. This is due to its small size, its stability, and its high mobility in nearly two-dimensional magnetic systems. Antiferromagnetic skyrmions stand out from ferromagnetic skyrmions because they need a lower current density and do not show Skyrmion Hall Effect in their dynamics. It is necessary to understand how an antiferromagnetic skyrmion behaves in a nanotrack, the control of its position and size is of fundamental importance for its application in spintronic devices. In this work we study the behavior of an antiferromagnetic skyrmion stabilized in a bilayer formed by potassium manganese trifluoride on platinum (KMnF3/P t). Our studies were carried out via micromagnetic computer simulation using proprietary software developed by our research group. As a result, we verified that the balance of Dzyaloshinskii-Moriya interactions and perpendicular magneto crystalline anisotropy is of fundamental importance in the stabilization of antiferromagnetic skyrmions, as well as in their size and shape. Obtaining the equilibrium state of a skyrmion initially positioned at the interface between two distinct antiferromagnetic means, we verified that the quasi-particle is attracted or repelled to a magnetically modified region, with this we conclude that it is possible to build traps for antiferromagnetic skyrmions. Skyrmion traps are important in controlling their position on the nano trail since the existence or absence of the skyrmion in a certain region can store information in binary form. We believe that this study is useful as a guide in the search for new materials capable of stabilizing antiferromagnetic skyrmions. The results contained in this work corroborate or extend the studies on antiferromagnetic skyrmions.