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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Skyrmions III (joint session MA/TT/KFM)

KFM 17.8: Vortrag

Mittwoch, 14. März 2018, 16:45–17:00, EB 301

Skyrmion dynamics under the influence of defects from DFT to ASD — •Jonathan Chico, Imara Lima Fernandes, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

Any potential skyrmionic application must be able to handle the impact of defects on the movement of skyrmions. Until now, most approaches focussed on large skyrmions and thus phenomenological schemes in the micromagnetic regime. In this work we discuss the technologically much more promising small skyrmions.

Using a combination of first-principles calculations and atomistic spin dynamics, the motion of small skyrmions in Pd/Fe/Ir(111) with 3d and 4d atomic defects is studied. In general, two types of defects are found, attractive and repulsive [1]. It can be observed that depending on the chemical nature of the defect the current threshold needed to overcome the energy barriers, resulting from the impurities, varies. The obtained dynamical behaviour is richer than what is expected from the Thiele equation. The complexity of the different motion regimes are revealed and compared with what is known for larger skyrmions. The present study also shines light on how one can engineer defects-based pathways for controlled skyrmion motion.

[1] I. L. Fernandes et al. submitted (2017).

Funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator grant 681405 - DYNASORE).