SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 47: Skyrmions IV

MA 47.7: Vortrag

Freitag, 31. März 2023, 11:15–11:30, HSZ 04

Bloch points in the ground state of chiral magnet nanocylinder — •Andrii Savchenko¹, Fengshan Zheng^2,3, Nikolai Kiselev¹, Luyan Yang^1,2, Qianqian Lan^1,2, Filipp Rybakov⁴, Stefan Blügel¹, and Rafal Dunin-Borkowski^1,2 — ¹Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany — ²Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425 Jülich, Germany — ³Spin-X Institute, South China University of Technology, Guangzhou 511442, China — ⁴Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden

Experimental observation of Bloch points (BPs) is challenging since these topological defects represent energetically unfavorable configurations and usually appear only as a metastable state. The present study aims to find the systems where due to the competition between short-range and long-range interactions the BPs can emerge in the ground state of the system. A nanocylinder of an isotropic chiral magnet might be a good candidate for such a system. We found that the dipole string - the configuration containing two coupled BPs of opposite topological charge, at some geometrical parameters corresponds to the lowest energy state in such nanocylinder. Our micromagnetic simulations with realistic parameters agree well with the results of the transmission electron microscopy experiment on the FeGe sample.