SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Poster II
MM 23.20: Poster
Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2
Strain-coupled polar textures in ferroelectric nanocylinders — •Svitlana Kondovych1 and Igor Lukyanchuk2 — 1Institute for Theoretical Solid State Physics, IFW Dresden, 01069 Dresden, Germany — 2Laboratory of Condensed Matter Physics, University of Picardie, 80039 Amiens, France
We consider ferroelectric PbTiO3 nanocylinders of various size hosting strain-coupled polarization vortices. Depending on the cylinder height and radius, the polarization either swirls around the c-oriented cylinder axis (c-vortex) or falls into the state with the a- or b-oriented vortex core (a-vortex). The emergence of vortices occurs due to the competition of elastic and electrostatic interactions and complies with the Arnold theorem for divergenceless vector fields, which exist as two types of topological excitations, either vortices or Hopfions [2]. In PbTiO3 cylinders, we observe the geometry- and temperature-induced vortex axis rotation and corresponding transition between the c- and a-vortex states. The resulting phase diagram, obtained by phase-field modeling in line with analytical calculations, illustrates the variety of polar textures in nanocylinders, applicable for the efficient design of ferroelectric-based device components.
S.K. acknowledges the support from the Alexander von Humboldt Foundation.
[1] S. Kondovych, et al., arXiv:2112.10129v3 (2022).
[2] I. Luk’yanchuk, et al., Nat. Commun. 11, 2433 (2020).