Li, Yaqi;
Zatterin, Edoardo;
Conroy, Michele;
Pylypets, Anastasiia;
Borodavka, Fedir;
Björling, Alexander;
Groenendijk, Dirk J;
... Zubko, Pavlo; + view all
(2022)
Electrostatically Driven Polarization Flop and strain-induced Curvature in free-standing Ferroelectric Superlattices.
Advanced Materials
10.1002/adma.202106826.
(In press).
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Abstract
The combination of strain and electrostatic engineering in epitaxial heterostructures of ferroelectric oxides offers many possibilities for inducing new phases, complex polar topologies, and enhanced electrical properties. However, the dominant effect of substrate clamping can also limit the electromechanical response and often leaves electrostatics to play a secondary role. Releasing the mechanical constraint imposed by the substrate can not only dramatically alter the balance between elastic and electrostatic forces, enabling them to compete on par with each other, but also activate new mechanical degrees of freedom, such as the macroscopic curvature of the heterostructure. In this work, an electrostatically driven transition from a predominantly out-of-plane polarized to an in-plane polarized state is observed when a PbTiO3 /SrTiO3 superlattice with a SrRuO3 bottom electrode is released from its substrate. In turn, this polarization rotation modifies the lattice parameter mismatch between the superlattice and the thin SrRuO3 layer, causing the heterostructure to curl up into microtubes. Through a combination of synchrotron-based scanning X-ray diffraction imaging, Raman scattering, piezoresponse force microscopy and scanning transmission electron microscopy, the crystalline structure and domain patterns of the curved superlattices are investigated, revealing a strong anisotropy in the domain structure and a complex mechanism for strain accommodation. This article is protected by copyright. All rights reserved.
| Type: | Article |
|---|---|
| Title: | Electrostatically Driven Polarization Flop and strain-induced Curvature in free-standing Ferroelectric Superlattices |
| Location: | Germany |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/adma.202106826 |
| Publisher version: | https://doi.org/10.1002/adma.202106826 |
| Language: | English |
| Additional information: | Copyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | ferroelectric domains, free-standing membranes, microtubes, strain engineering |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10142688 |
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