Mechanical Removal and Rescreening of Local Screening Charges at Ferroelectric Surfaces

In this paper, we report the kinetics of screening charge removal and rescreening on periodically poled lithium niobate using charge-gradient microscopy and electrostatic force microscopy (EFM). A minimum pressure needs to be applied to initiate mechanical screening charge removal, and increasing th...

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Bibliographic Details
Published in:Physical review applied 2015-01, Vol.3 (1), Article 014003
Main Authors: Tong, Sheng, Park, Woon Ik, Choi, Yoon-Young, Stan, Liliana, Hong, Seungbum, Roelofs, Andreas
Format: Article
Language:English
Subjects:
charge gradient microscopy
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
electrostatic force microscopy
ferroelectric surface
kinetics of adsorption
piezoresponse force microscopy
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Summary:In this paper, we report the kinetics of screening charge removal and rescreening on periodically poled lithium niobate using charge-gradient microscopy and electrostatic force microscopy (EFM). A minimum pressure needs to be applied to initiate mechanical screening charge removal, and increasing the pressure leads to further removal of charge until a threshold is reached when all screening charges are removed. We fit all rescreening EFM contrast curves under various pressures into a universal exponential decay. Finally, the findings imply that we can control the screening degree of ferroelectric surfaces by mechanical means without affecting the polarization underneath.
ISSN:2331-7019
2331-7019
DOI:10.1103/PhysRevApplied.3.014003