Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/459
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Title: Depolarization of a piezoelectric film under an alternating current field
Authors: Kwok, KW 
Cheung, MK
Chan, HLW 
Choy, CL 
Issue Date: 13-Mar-2007
Source: Journal of applied physics, 13 Mar. 2007, v. 101, 054108, p. 1-6
Abstract: In this article, we demonstrate that a sol-gel-derived niobium-doped lead zirconate titanate film can be depolarized by the application of alternating current (ac) fields of diminishing amplitude and we explain the phenomenon based on the concept of the Preisach model. The amplitude of the ac fields is decreased from 20 to 2 MV/m in ten steps. The observed piezoelectric coefficient of the film decreases after each ac field step. Depending on the initial polarization and the direction of the ac fields, the piezoelectric coefficient can decrease to a very small value indicating the complete depolarization of the film. Our results reveal the existence of a distribution of the switching fields in the microdomains (Preisach dipolar units), and that because of mutual interactions the magnitudes of the switch-up and switch-down fields for each microdomain are not necessarily the same. Our results also suggest that the sputter deposition of the top electrode can induce more “down-state” microdomains, thus giving rise to an initial polarization in the film. Because of interactions with other microdomains or other effects, part of these microdomains exhibit very high switching fields.
Keywords: Lead compounds
Niobium
Piezoelectric materials
Piezoelectric thin films
Dielectric polarisation
Electric domains
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in K.W. Kwok et al. . Appl. Phys. 101, 054108 (2007) and may be found at http://link.aip.org/link/?jap/101/054108
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