SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 2: Skyrmions I

MA 2.1: Hauptvortrag

Montag, 27. März 2023, 09:30–10:00, HSZ 02

Two-dimensional Skyrmions in the real three-dimensional world — •Nikolai Kiselev — Institute for Advanced Simulation and Peter Grünberg Institute, Forschungsyentrum Jülich, 52425 Jülich Germany

Chiral skyrmions (CSs) emerging in noncentrosymmetric magnetic crystals are a prominent example of topological magnetic solitons -- objects possessing properties of ordinary particles. In three-dimensional (3D) bulk samples, CSs usually form vortex-like strings penetrating the whole sample. Although CSs emerge as 3D objects, the two-dimensional (2D) model of a chiral magnet still represents a powerful tool for the theoretical study of CSs. In this talk, I'll present an overview of those phenomena predicted by the 2D model that found its experimental confirmation. In particular, I'll discuss the diversity of CSs with arbitrary topological charge [1] -- skyrmions bags, the effect of turning skyrmions inside out [2], and the related phenomenon of skyrmion-antiskyrmion coexistence [3]. The discussion of the above phenomena is supported by a high-resolution transmission electron microscopy experiment. As an illustration of a phenomenon that cannot be described in a simplified 2D model, I'll present the theoretical and experimental study of so-called skyrmion braiding -- the emergence of superstructures of skyrmion strings that wind around one another [4].

[1] F. N. Rybakov & N. S. Kiselev, Phys. Rev. B 99, 064437 (2019). [2] V. M. Kuchkin & N. S. Kiselev, Phys. Rev. B 101, 064408 (2020). [3] F. Zheng et al., Nature Phys. (2022) 18, 863 (2022). [4] F. Zheng et al., Nature Commun. 12, 5316 (2021).