Probing the Surface Polarization of Ferroelectric Thin Films by X-ray Standing Waves
ORAL
Abstract
In this study, we demonstrate that the X-ray standing wave technique in combination with X-ray photoelectron spectroscopy can provide the amplitude and orientation of the local ferroelectric polarization near the surface of a ferroelectric thin film. The X-ray standing wave technique provides Ba and Ti atomic positions, and thus the local ferroelectric polarization, within the topmost 3 unit cells below the surface of three differently strained BaTiO3 thin films grown on scandate substrates, with a SrRuO3 film as bottom electrode. We interpret the measured polarization profiles based on the kind, content and spatial distribution of oxygen-containing adsorbates at the surface.
*D.P acknowledges funding from 'la Caixa' Foundation fellowship (ID 100010434). I.S. and D.P. acknowledge financial support from the Spanish Ministerio de Ciencia e Innovacion (MICINN), grant No. PID2019-109931GB-I00. The ICN2 is funded by the CERCA programme / Generalitat de Catalunya and by the Severo Ochoa Centres of Excellence Programme, funded by the Spanish Research Agency (AEI, CEX2021-001214-S).
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Publication: Le Phuong Hoang, Irena Spasojevic, Tien-Lin Lee, David Pesquera, Kai Rossnagel, Jörg Zegenhagen, Gustau Catalan, Ivan A Vartanyants, Andreas Scherz, Giuseppe Mercurio. Probing the surface polarization of ferroelectric thin films by X-ray standing waves. https://arxiv.org/abs/2309.01673
Presenters
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Le Phuong Hoang
- European XFEL GmbH
- European XFEL