Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.10: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Exploring the limitations of the micromagnetic framework with a stable Bloch point — •Thomas Brian Winkler1, Marijan Beg2, Martin Lang3,4, Mathias Kläui1, and Hans Fangohr3,4 — 1Institut für Physik, JGU Mainz — 2Department of Earth Science and Engineering, Imperial College London — 3Faculty of Engineering and Physical Sciences, University of Southampton — 4Max Planck Institute for the Structure and Dynamics of Matter Hamburg
Bloch points [1,2] are well-known magnetisation configurations that often occur in transient processes. However, recent simulations have shown that opposing chiralities of layers in a thin-film geometry can stabilise such magnetic Bloch points and make them equilibrium states [3], potentially opening the door towards Bloch point based spintronic applications [4]. An open question, from a methodological point of view, is whether the Heisenberg model approach (atomistic model) must be used to study such systems or if the -- computationally more efficient -- micromagnetic models can be used as well. In this work, we are investigating and comparing the energetics and dynamics of a stable Bloch point [3,4] obtained using both Heisenberg and micromagnetic approaches.
[1] Ricardo Gabriel Elías et al., Eur. Phys. J. B 82, 159-166 (2011). [2] Oleksandr V. Pylypovskyi et al., Phys. Rev. B 85, 224401 (2012). [3] Marijan Beg et al., Scientific Reports 9, 7959 (2019). [4] Martin Lang et al., Bloch points in nanostrips, arxiv:2203.13689 (2022).