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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.26: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Time-resolved imaging of vortex domain wall motion and chirality rectification in curved nanowires — •Daniel Schönke1, Robert M. Reeve1, Hermann Stoll2, and Mathias Kläui1 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — 2Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
Controlling the vortex domain wall (DW) chirality is important for chirality-encoded DW logic and for other devices based on propagating DWs due to chirality-dependent motion behaviour. Among several ideas to control the chirality, spin rectifying corners and end domains have been proposed [1,2]. We investigated domain-wall motion and chirality control in asymmetric Ni80Fe20 halfring pairs by time-resolved imaging using a scanning electron microscope with polarization analysis [3]. This method allows us not only to directly observe the dynamics with nanosecond resolution, but also to determine the probabilities of different switching pathways and the associated chirality protection. The experiments were complemented by micromagnetic simulations. The results reveal that the control of chirality by curvature works with very high reliability, whereas the chirality at the wire ends is less reproducible. Furthermore the attractive interaction of vortex DWs in adjacent wires plays a key role in the dynamics with the interaction being stronger for DWs with the same chirality. [1] Omari et al., Appl. Phys. Lett. 107, 222403 (2015) [2] Wilhelm et al., Appl. Phys. Lett. 95, 252501 (2009) [3] Schönke et al., Rev. Sci. Instrum. 89, 083703 (2018)