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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 1: Focus: Domains and Domainwalls in (Multi)Ferroics I

KFM 1.4: Talk

Monday, March 27, 2023, 10:10–10:30, POT 51

Probing hidden order in ferroelectric oxide thin films with single crystal diffuse X-ray scattering — •Joohee Bang¹, Nives Strkalj², Martin Sarott¹, Morgan Trassin¹, and Thomas Weber¹ — ¹Department of Materials Science, ETH Zurich, Zurich, Switzerland — ²Department of Materials Science and Metallurgy, Cambridge University, Cambridge, United Kingdom

Ferroelectric thin films have attracted great attention for its rich applications in energy-efficient electronic devices because of functional properties such as high dielectric constants and electrically switchable polarization. Recently, ferroelectric oxide superlattices with complex topologies such as long-range vortex-antivortex arrays of polarization have garnered much interest as they hold promise for alternative device configurations for microelectronics [1]. Here, we report on a newly discovered local order state in ferroelectric superlattices using a complete three-dimensional diffuse X-ray scattering data, which was collected by taking advantage of high-energy synchrotron X-rays in ultra-small grazing incidence geometry. The data was analyzed with the 3D-deltaPDF method [2], which not only gives a three-dimensional view of the disorder, but also the access to weak disorder that was previously not accessible. This work will contribute to understanding structure-property correlations of ferroelectric oxide superlattices and lay groundwork for developing a novel solid-state characterization technique.

[1] Yadav et al., Nature 530, 206; S. Das et al., Nature 568, 2019

[2]Weber and Simonov, Z. Kristallogr. 227, 2012