Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Skyrmions II (joint session MA/TT)

TT 37.1: Hauptvortrag

Mittwoch, 18. März 2020, 09:30–10:00, POT 6

Anatomy of skyrmion-defect interactions and their impact on detection protocols — •Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Magnetic skyrmions are topological swirling spin-textures with enormous potential for new technologies that store, transport and read information. However, imperfections are intrinsic to any real device, affecting the detection, nucleation, type of motion and velocity of a skyrmion. I will discuss our first-principles investigations of the electronic, magnetic and transport properties of single skyrmions interacting with 3d and 4d impurities embedded in PdFe/Ir(111). We found that the obtained energy landscape has a universal shape as function of the defect’s electron filling, enabling predictions of the repulsive or attractive nature of the impurity [1]. This finding can be used to design complex energy profiles with targeted properties via atom-by-atom manufacturing of multi-atomic defects. Finally, I address how the latter affect the electronic structure and the chiral orbital magnetism, with consequences for the efficiency of skyrmion detection protocols, either all-electrical [2,3] or optical [4]. — Work done with I. L. Fernandes, J. Bouaziz, D. M. Crum, M. dos Santos Dias, M. Bouhassoune, I. Gede Arjana, J. Chico and S. Blügel and supported by the EU Horizon 2020 via ERC-consolidator Grant No. 681405–DYNASORE.

[1] Fernandes et al., Nat. Commun. 9, 4395 (2018); [2] Fernandes et al., ArXiv:1906.08838; [3] Crum et al., Nat. Commun. 6, 8541 (2015); [4] dos Santos Dias et al., Nat. Commun. 7, 13613 (2016)

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