Zatterin, Edoardo;
Ondrejkovic, Petr;
Bastogne, Louis;
Lichtensteiger, Céline;
Tovaglieri, Ludovica;
Chaney, Daniel A;
Sasani, Alireza;
... Hadjimichael, Marios; + view all
(2024)
Assessing the Ubiquity of Bloch Domain Walls in Ferroelectric Lead Titanate Superlattices.
Physical Review X
, 14
(4)
, Article 041052. 10.1103/physrevx.14.041052.
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Abstract
The observation of unexpected polarization textures such as vortices, skyrmions, and merons in various oxide heterostructures has challenged the widely accepted picture of ferroelectric domain walls as being Ising-like. Bloch components in the 180° domain walls of PbTiO3 have recently been reported in PbTiO3/SrTiO3 superlattices and linked to domain wall chirality. While this opens exciting perspectives, the ubiquity of this Bloch component remains to be further explored. In this work, we present a comprehensive investigation of domain walls in PbTiO3/SrTiO3 superlattices, involving a combination of first- and second-principles calculations, phase-field simulations, diffuse scattering calculations, and synchrotron-based diffuse x-ray scattering. Our theoretical calculations highlight that the previously predicted Bloch polarization in the 180° domain walls in PbTiO3/SrTiO3 superlattices might be more sensitive to the boundary conditions than initially thought and is not always expected to appear. Employing diffuse scattering calculations for larger systems, we develop a method to probe the complex structure of domain walls in these superlattices via diffuse x-ray scattering measurements. Through this approach, we investigate depolarization-driven ferroelectric polarization rotation at the domain walls. Our experimental findings, consistent with our theoretical predictions for realistic domain periods, do not reveal any signatures of a Bloch component in the centers of the 180° domain walls of PbTiO3/SrTiO3 superlattices, suggesting that the precise nature of domain walls in the ultrathin PbTiO3 layers is more intricate than previously thought and deserves further attention.
| Type: | Article |
|---|---|
| Title: | Assessing the Ubiquity of Bloch Domain Walls in Ferroelectric Lead Titanate Superlattices |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/physrevx.14.041052 |
| Publisher version: | http://dx.doi.org/10.1103/physrevx.14.041052 |
| 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. |
| Keywords: | Ferroelectric domains Ferroelectric phase transition Ferroelectricity Polarization vortices, Superlattices, First-principles calculations, Phase-field modeling, X-ray diffraction, X-ray diffuse scattering |
| UCL classification: | UCL 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: | https://discovery.ucl.ac.uk/id/eprint/10200842 |
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