Journal Article

PUBDB-2024-06389

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Surface polarization profile of ferroelectric thin films probed by X-ray standing waves and photoelectron spectroscopy

Hoang, L. P. ; Spasojevic, I.Extern*XFEL.EU* ; Lee, T.-L. ; Pesquera, D.Extern*XFEL.EU* ; Rossnagel, K.DESY* ; Zegenhagen, J.Extern* ; Catalan, G.Extern*XFEL.EU* ; Vartanyants, I. A.XFEL.EU*DESY* ; Scherz, A.XFEL.EU* ; Mercurio, G. (Corresponding author)Extern*XFEL.EU*

2024
Macmillan Publishers Limited, part of Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41598-024-72805-1  doi:10.3204/PUBDB-2024-06389

Abstract: Understanding the mechanisms underlying a stable polarization at the surface of ferroelectric thin films is of particular importance both from a fundamental point of view and to achieve control of the surface polarization itself. In this study, we demonstrate that the X-ray standing wave technique allows the surface polarization profile of a ferroelectric thin film, as opposed to the average film polarity, to be probed directly. The X-ray standing wave technique provides the average Ti and Ba atomic positions, along the out-of-plane direction, near the surface of three differently strained BaTiO$_3$ thin films. This technique gives direct access to the local ferroelectric polarization at and below the surface. By employing X-ray photoelectron spectroscopy, a detailed overview of the oxygen-containing species adsorbed on the surface is obtained. The different amplitude and orientation of the local ferroelectric polarizations are associated with surface charges attributed to different type, amount and spatial distribution of the oxygen-containing adsorbates.

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Contributing Institute(s):

1. FS-SXQM (FS-SXQM)
2. FS-Photon Science (FS-PS)
3. SCS (XFEL_E2_SCS)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2024

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