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Domain Wall Orientations in Ferroelectric Superlattices Probed with Synchrotron X-Ray Diffraction

Hadjimichael, M; Zatterin, E; Fernandez-Peña, S; Leake, SJ; Zubko, P; (2018) Domain Wall Orientations in Ferroelectric Superlattices Probed with Synchrotron X-Ray Diffraction. Physical Review Letters , 120 (3) , Article 037602. 10.1103/PhysRevLett.120.037602. Green open access

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Abstract

Ferroelectric domains in PbTiO3/SrTiO3 superlattices are studied using synchrotron x-ray diffraction. Macroscopic measurements reveal a change in the preferential domain wall orientation from {100} to {110} crystallographic planes with increasing temperature. The temperature range of this reorientation depends on the ferroelectric layer thickness and domain period. Using a nanofocused beam, local changes in the domain wall orientation within the buried ferroelectric layers are imaged, both in structurally uniform regions of the sample and near defect sites and argon ion-etched patterns. Domain walls are found to exhibit a preferential alignment with the straight edges of the etched patterns as well as with structural features associated with defect sites. The distribution of out-of-plane lattice parameters is mapped around one such feature, showing that it is accompanied by inhomogeneous strain and large strain gradients.

Type: Article
Title: Domain Wall Orientations in Ferroelectric Superlattices Probed with Synchrotron X-Ray Diffraction
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.120.037602
Publisher version: http://doi.org/10.1103/PhysRevLett.120.037602
Language: English
Additional information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
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
URI: http://discovery.ucl.ac.uk/id/eprint/10042047
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