A 2D ferroelectric vortex pattern in twisted BaTiO 3 freestanding layers.

Autor: Sánchez-Santolino G; GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain. gsanchezsantolino@ucm.es.; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain. gsanchezsantolino@ucm.es., Rouco V; GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain. vrouco@ucm.es., Puebla S; Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain., Aramberri H; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch-sur-Alzette, Luxembourg., Zamora V; GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain., Cabero M; ICTS Centro Nacional de Microscopia Electrónica 'Luis Brú', Universidad Complutense, Madrid, Spain., Cuellar FA; GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain., Munuera C; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain.; Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain., Mompean F; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain.; Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain., Garcia-Hernandez M; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain.; Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain., Castellanos-Gomez A; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain.; Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain., Íñiguez J; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch-sur-Alzette, Luxembourg.; Department of Physics and Materials Science, University of Luxembourg, Belvaux, Luxembourg., Leon C; GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain.; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain., Santamaria J; GFMC, Departamento Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain. jacsan@ucm.es.; Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, Madrid, Spain. jacsan@ucm.es.
Jazyk: angličtina
Zdroj: Nature [Nature] 2024 Feb; Vol. 626 (7999), pp. 529-534. Date of Electronic Publication: 2024 Feb 14.
DOI: 10.1038/s41586-023-06978-6
Abstrakt: The wealth of complex polar topologies 1-10 recently found in nanoscale ferroelectrics results from a delicate balance between the intrinsic tendency of the materials to develop a homogeneous polarization and the electric and mechanical boundary conditions imposed on them. Ferroelectric-dielectric interfaces are model systems in which polarization curling originates from open circuit-like electric boundary conditions, to avoid the build-up of polarization charges through the formation of flux-closure 11-14 domains that evolve into vortex-like structures at the nanoscale 15-17 level. Although ferroelectricity is known to couple strongly with strain (both homogeneous 18 and inhomogeneous 19,20 ), the effect of mechanical constraints 21 on thin-film nanoscale ferroelectrics has been comparatively less explored because of the relative paucity of strain patterns that can be implemented experimentally. Here we show that the stacking of freestanding ferroelectric perovskite layers with controlled twist angles provides an opportunity to tailor these topological nanostructures in a way determined by the lateral strain modulation associated with the twisting. Furthermore, we find that a peculiar pattern of polarization vortices and antivortices emerges from the flexoelectric coupling of polarization to strain gradients. This finding provides opportunities to create two-dimensional high-density vortex crystals that would enable us to explore previously unknown physical effects and functionalities.
(© 2024. The Author(s).)
Databáze: MEDLINE
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