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MA: Fachverband Magnetismus

MA 54: Spin Hall Effects and Skyrmions II

MA 54.6: Vortrag

Donnerstag, 23. März 2017, 16:30–16:45, HSZ 04

Impact of the chemical nature of defects on the pinning of magnetic skyrmions. — •Imara L. Fernandes, Juba Bouaziz, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

Owing to their topology, magnetic skyrmions are considered as potential particles for future information technology. The low current densities estimated to move them in a racetrack memory promises devices of low energy consumption. One issue that is currently discussed is the speed of skyrmions. Experiments indicate that skyrmions are more than one order of magnitude slower than domain walls. In a device, skyrmions interact with defects, affecting their creation, stability and motion. Following our previous study [1], we investigate purely from a full ab initio description based on density functional theory (DFT) the impact of 3d and 4d impurities on the energetics, electronic and magnetic properties of realistic nano-skyrmions created in Pd/Fe/Ir(111) substrate. With a careful analysis of the hybridization of the electronic states, we identify the important mechanisms behind the expulsion or pinning of single magnetic skyrmions as function of the chemical nature of the impurities that translate on a bigger picture to an energy landscape with attractive and repulsive potentials determining the skyrmion motion.

[1] D.M. Crum et al., Nat. Comms. 6, 8541 (2015).

Funding provided by the ERC-consolidator grant Dynasore and CNPq (Brazil).