Surface Chemistry Controls Anomalous Ferroelectric Behavior in Lithium Niobate

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Title: Surface Chemistry Controls Anomalous Ferroelectric Behavior in Lithium Niobate
Authors: Neumayer, Sabine M.Ievlev, Anton V.Collins, LiamRodriguez, Brian al.
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Date: 31-Jul-2018
Online since: 2021-03-02T16:11:24Z
Abstract: Polarization switching in ferroelectric materials underpins a multitude of applications ranging from nonvolatile memories to data storage to ferroelectric lithography. While traditionally considered to be a functionality of the material only, basic theoretical considerations suggest that switching is expected to be intrinsically linked to changes in the electrochemical state of the surface. Hence, the properties and dynamics of the screening charges can affect or control the switching dynamics. Despite being recognized for over 50 years, analysis of these phenomena remained largely speculative. Here, we explore polarization switching on the prototypical LiNbO3 surface using the combination of contact mode Kelvin probe force microscopy and chemical imaging by time-of-flight mass-spectrometry and demonstrate pronounced chemical differences between the domains. These studies provide a consistent explanation to the anomalous polarization and surface charge behavior observed in LiNbO3 and point to new opportunities in chemical control of polarization dynamics in thin films and crystals via control of surface chemistry, complementing traditional routes via bulk doping, and substrate-induced strain and tilt systems.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: American Chemical Society
Journal: ACS Applied Materials and Interfaces
Volume: 10
Issue: 34
Start page: 29153
End page: 29160
Copyright (published version): 2018 American Chemical Society
Keywords: FerroelectricsSurface chemistryLithium niobateSwitching dynamicsScanning probe microscopyTime-of-flight secondary ion mass spectrometryPiezoresponse force microscopyScanning probe microscopy
DOI: 10.1021/acsami.8b09513
Language: en
Status of Item: Peer reviewed
ISSN: 1944-8244
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Appears in Collections:Conway Institute Research Collection
Physics Research Collection

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