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SYCL: Symposium Curvilinear condensed matter

SYCL 1: Curvilinear Condensed Matter

SYCL 1.2: Hauptvortrag

Freitag, 20. März 2020, 10:00–10:30, HSZ 02

Properties of domain walls and skyrmions in curved ferromagnets. — •Volodymyr Kravchuk — Karlsruher Institut für Technologie, Karlsruhe, Germany — Bogolyubov Institute for Theoretical Physics, Kyiv, Ukraine

In the presence of the curvature, the topological magnetic solitons (domain walls, skyrmions, vortices) gain a number of new properties. A spatially localized curvature defect can generate the pinning as well as the repulsion potential for domain walls and skyrmions (depending on the signs of the curvature and topological charge of the soliton and also on its helicity). For a large amplitude defect, the pinned skyrmion demonstrates a multiplet of equilibrium states forming the ladder for the energy levels. The transitions between the layers can be controlled by pulses of the external magnetic field. Curvature drastically changes the dynamical properties of the topological solitons: the current-driven domain wall can demonstrate the negative mobility in three-dimensional curvilinear wire with torsion; the gradient of the mean curvature of the film results in the driving force acting on magnetic skyrmions; curvature enriches the spectrum of the spin eigenexitations of the skyrmion. Curvature generally couples the geometrical chirality of the magnet and spin chirality of the magnetic texture. This results in the chirality symmetry breaking effects, e.g. for the domain wall on the Moebius stripe, in the core switching process for a magnetic vortex on a spherical shell.