SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 26: Non-Skyrmionic Magnetic Textures II
MA 26.4: Vortrag
Mittwoch, 29. März 2023, 10:45–11:00, HSZ 401
Investigating a stable Bloch point in a magnetic disk comprising layers with two different chiralities — •Thomas Brian Winkler1, Marijan Beg2, Martin Lang3,4, Mathias Kläui1, and Hans Fangohr3,4 — 1Institute of Physics, Johannes Gutenberg University Mainz, Germany — 2Department of Earth Science and Engineering, Imperial College London, United Kingdom — 3Faculty of Engineering and Physical Sciences, University of Southampton, United Kingdom — 4Max Planck Institute for the Structure and Dynamics of Matter Hamburg, Germany
Bloch points (BPs) are highly confined spin structures, that often occur in transient processes [1]. However, they can also be stabilized in specific systems. Beg et al. showed the existence of a stable Bloch point by stacking two cylindrical nanodisks of FeGe on top of each other, with opposite sign of the DMI vector [2]. In both layers a magnetic vortex is formed, with the same circularity, but opposite polarity, leading to a Bloch point at the interface. In this study we investigate the energetics of the system within the micromagnetic (MM) framework and validate results with atomistic simulations. Further, an in-plane field is applied to shift the BP out of the center of the disk. The dynamics of the system are analysed after the field switch-off. The BP does not show any precessional motion, which is different to a classical magnetic vortex [3]. We also find, that qualitatively, the MM framework produces the same results as atomistic simulation.
[1] T. B. Winkler et al., PRApplied 16, 044014 (2021). [2] M. Beg et al., Sci Rep 9, 7959 (2019). [3] K. Yu. et al., JAP 91, 8037 (2002).