Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Magnetic Textures: Statics and experimental imaging

MA 3.1: Vortrag

Montag, 20. März 2017, 09:30–09:45, HSZ 101

Topological orbital moments — what they are and where to find them — •Manuel dos Santos Dias, Juba Bouaziz, Mohammed Bouhassoune, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

Unconventional magnetic structures, such as skyrmions, host ground state emergent magnetic fields that lead to orbital magnetism, even without the spin-orbit interaction. We have recently explored the properties of these emergent orbital moments [1], starting with first-principles calculations for trimers. Armed with this understanding, we study the orbital magnetism of skyrmions, and demonstrate that the contribution driven by the emergent magnetic field is topological. This means that the topological contribution to the orbital moment does not change under continuous deformations of the magnetic structure. Furthermore, we use it to propose a new experimental protocol for the identification of topological magnetic structures, by soft x-ray spectroscopy.
This work is supported by the HGF-YIG Programme VH-NG-717 (Funsilab) and the ERC Consolidator grant DYNASORE. S.B. acknowledges funding from the European Union’s Horizon 2020 grant number 665095 (FET-Open project MAGicSky).
[1] M. dos Santos Dias et al., Nat. Commun. 7, 13613 (2016)