Surface polarization profile of ferroelectric thin films probed by X-ray standing waves and photoelectron spectroscopy.

Autor: Hoang LP; European XFEL, 22869, Schenefeld, Germany.; Max Planck Institute for the Structure and Dynamics of Matter, 22761, Hamburg, Germany.; Institute of Experimental and Applied Physics, Kiel University, 24098, Kiel, Germany., Spasojevic I; Department de Física, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain., Lee TL; Diamond Light Source Ltd., Didcot, OX110DE, Oxfordshire, UK., Pesquera D; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, 08193, Bellaterra, Barcelona, Spain., Rossnagel K; Institute of Experimental and Applied Physics, Kiel University, 24098, Kiel, Germany.; Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany., Zegenhagen J; Diamond Light Source Ltd., Didcot, OX110DE, Oxfordshire, UK., Catalan G; Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, 08193, Bellaterra, Barcelona, Spain.; Institucio Catalana de Recerca i Estudis Avançats (ICREA), 08010, Barcelona, Catalonia, Spain., Vartanyants IA; Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany., Scherz A; European XFEL, 22869, Schenefeld, Germany., Mercurio G; European XFEL, 22869, Schenefeld, Germany. giuseppe.mercurio@xfel.eu.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Oct 16; Vol. 14 (1), pp. 24250. Date of Electronic Publication: 2024 Oct 16.
DOI: 10.1038/s41598-024-72805-1
Abstrakt: 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 [Formula: see text] 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.
(© 2024. The Author(s).)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje