SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.14: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Bloch points in helimagnetic nanostrips — •Martin Lang1,2, Marijan Beg1,3, Ondrej Hovorka1, and Hans Fangohr1,2, 4 — 1University of Southampton, Southampton, United Kingdom — 2Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 3Imperial College London, London, United Kingdom — 4Center for Free-Electron Laser Science, Hamburg, Germany
Complex magnetic materials hosting topologically non-trivial particle-like objects such as skyrmions are intensely researched. One important class of materials are helimagnetic materials with Dzyaloshinskii-Moriya interaction. Recently, it was demonstrated that nanodisks consisting of two layers with opposite chirality can host a single stable Bloch point (BP) of two different types [1]. The BP represents an interesting topological excitation in a helimagnetic system, which expands the set of well-known magnetic states such as domain walls, vortices, and skyrmions.
In this work [2], we use micromagnetic simulations [3] to show that FeGe nanostrips consisting of two layers with opposite chirality can host multiple coexisting BPs. We demonstrate that the two different BP types can be geometrically arranged in any arbitrary order and these magnetization configurations are meta-stable. We can determine an optimal spacing between BPs within a line of BPs allowing us to predict strip geometries suitable for an arbitrary number of BPs.
[1] M. Beg et al., Scientific Reports, 9, p. 7959 (2019). [2] M. Lang et al. arXiv:2203.13689 (2022). [3] M. Beg, M. Lang and H. Fangohr, IEEE Transactions on Magnetics, 58, p. 7300205 (2022).