Electrostatically driven polarization flop and strain-induced curvature in free-standing ferroelectric superlattices

0556818 - FZÚ 2023 RIV DE eng J - Journal Article
Li, J. - Zatterin, E. - Conroy, M. - Pylypets, Anastasiia - Borodavka, Fedir - Bjorling, A. - Groenendijk, D.J. - Lesne, E. - Clancy, A.J. - Hadjimichael, M. - Kepaptsoglou, D. - Ramasse, Q. M. - Caviglia, A.D. - Hlinka, Jiří - Bangert, U. - Leake, S. J. - Zubko, P.
Electrostatically driven polarization flop and strain-induced curvature in free-standing ferroelectric superlattices.
Advanced Materials. Roč. 34, č. 15 (2022), č. článku 2106826. ISSN 0935-9648. E-ISSN 1521-4095
R&D Projects: GA ČR GX19-28594X
Institutional support: RVO:68378271
Keywords : superlattice * heterostructure * feroelectrics * X-ray diffraction * Raman spectroscopy * PFM * TEM
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 29.4, year: 2022
Method of publishing: Open access

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.
Permanent Link: https://hdl.handle.net/11104/0336320