Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 6: Skyrmions I

MA 6.4: Talk

Monday, March 17, 2025, 16:00–16:15, H16

Skyrmion bags embedded in the skyrmion lattice — •Nikolai S. Kiselev — Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany

The micromagnetic model of 2D chiral magnets predicts the existence of skyrmion bags -- solitons with arbitrary topological charge [1]. Recent experiments have confirmed the stability of skyrmion bags with positive topological charges [2,3]. Using Lorentz TEM on thin plates of B20-type FeGe, we demonstrate the remarkable stability of skyrmion bags with negative charges embedded within a skyrmion lattice [4]. We outline a robust protocol for nucleating these embedded skyrmion bags, which remain stable even in zero or inverted external magnetic fields. Our findings are in excellent agreement with micromagnetic simulations.

[1] F.N. Rybakov, N.S. Kiselev Phys. Rev. B, 99, 064437 (2019). [2] J. Tang et al., Nature Nanotechnol. 16, 1086 (2021). [3] Y. Zhang et al., Nature Commun. 15, 3391 (2024). [4] L. Yang et al., Adv. Mater. 36, 2403274 (2024).

Keywords: skyrmion bags; Lorentz TEM; micromagnetics; B20-type FeGe