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Title: Effects of polarization and permittivity gradients and other parameters on the anomalous vertical shift behavior of graded ferroelectric thin films
Authors: Zhou, Y
Chan, HK
Lam, CH 
Shin, FG
Issue Date: 1-Aug-2005
Source: Journal of applied physics, 1 Aug. 2005, v. 98, no. 3, 034105, p. 1-6
Abstract: We studied theoretically the dependence of the “polarization offset” on various parameters in compositionally graded ferroelectric thin films. Our model adopts the Landau-Khalatnikov equation to describe hysteresis behavior and takes the time-dependent space-charge-limited conductivity into account to investigate the effects of polarization and permittivity gradients, charge mobilities, and thickness in graded ferroelectric thin films. We found that both polarization and permittivity gradients are requisite for the occurrence of offset phenomena. It is also found that larger gradients of remanent polarization and permittivity, a smaller thickness, and a larger charge mobility can generally enhance the effect of vertical offsets. The qualitative agreement between simulation and experiment further supports our previous notion that the asymmetric conduction current arising as a result of the composition gradient is an important factor leading to the polarization offset phenomenon.
Keywords: Ferroelectric thin films
Dielectric polarisation
Permittivity
Dielectric hysteresis
Electrical conductivity
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.1996833
Rights: © 2005 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 Y. Zhou et al., J. Appl. Phys. 98, 034105 (2005) and may be found at http://link.aip.org/link/?jap/98/034105.
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