Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I
MA 20.32: Poster
Dienstag, 19. März 2024, 16:30–19:00, Poster A
Effects of curvature and torsion on domain wall velocity in antiferromagnetic helix-shaped spin chain exposed to rotating magnetic field — •Yelyzaveta A. Borysenko1, Kostiantyn V. Yershov2, Denis D. Sheka3, and Jeroen van den Brink2 — 1Department of Physics, University of Konstanz, DE-78457 Konstanz, Germany — 2Institute for Theoretical Solid State Physics, IFW Dresden, 01069 Dresden, Germany — 3Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
Antiferromagnetically ordered (AFM) spin chains arranged along space curves possess geometry-driven magnetic interactions, described by chain curvature and torsion. These interactions by symmetry resemble anisotropic and Dzyaloshinskii-Moriya contributions, originate from exchange, dipolar interaction and intrinsic anisotropy in samples of curved shape [1, 2] and determine the ground state and spin dynamics of such systems [2, 3]. Here, we investigate helix-shaped AFM spin chains (constant curvature and torsion) and describe domain wall dynamics in such system being exposed to rotating magnetic field. Domain wall propagates with velocity, proportional to magnetic field frequency. The relation between the external field and geometrical parameters of the spin chain determines two motion modes: oscillating one and rigid motion with a constant velocity. Curvature and torsion strongly affect stability conditions of the rigid motion mode and domain wall velocity. [1] O. V. Pylypovskyi et al., App. Phys. Lett., 118, 182405 (2021); [2] O. V. Pylypovskyi et al., Nano Lett., 20, 8157-8162 (2020); [3] D. Makarov et al., Adv. Mat., 34, 2101758 (2022)
Keywords: domain wall, curvilinear magnetism, spin chain