SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Skyrmions I (joint session MA/KFM)

MA 7.1: Hauptvortrag

Mittwoch, 29. September 2021, 10:00–10:30, H5

Anatomy of skyrmion-defect interactions and their impact on detection protocols — •Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — Faculty of Physics, University of Duisburg-Essen and CENIDE, 47053 Duisburg, Germany

Magnetic skyrmions are topological swirling spin-textures with enormous potential for new technologies that store, transport and read information. However, imperfections intrinsic to any real device lead to pinning or repulsion of skyrmions, generate complexity in their motion and challenge their application as future bits of information. 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 skyrmions energy landscapes have 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 [2,3]. Finally, I address how the latter affect the electronic structure and the chiral orbital magnetism, with consequences for the efficiency of skyrmion detection protocols [4], either all-electrical or optical.
– Work funded by Horizon 2020–ERC (CoG 681405–DYNASORE).
[1] Fernandes et al., Nat. Commun. 9, 4395 (2018); [2] Arjana et al. Sci. Rep. 10, 14655 (2020); [3] Fernandes et al., JPCM 32, 425802 (2020); [4] Fernandes et al., Nat. Commun. 11, 1602 (2020).