Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4995
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dc.contributorDepartment of Electronic and Information Engineering-
dc.creatorCai, MQ-
dc.creatorZheng, Y-
dc.creatorMa, PW-
dc.creatorWoo, CH-
dc.date.accessioned2014-12-11T08:25:09Z-
dc.date.available2014-12-11T08:25:09Z-
dc.identifier.issn0021-8979-
dc.identifier.urihttp://hdl.handle.net/10397/4995-
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.rights© 2011 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 M. Q. Cai et al., J. Appl. Phys. 109, 024103 (2011) and may be found at http://link.aip.org/link/?jap/109/024103.en_US
dc.subjectAb initio calculationsen_US
dc.subjectBarium compoundsen_US
dc.subjectCharge exchangeen_US
dc.subjectDensity functional theoryen_US
dc.subjectDielectric polarisationen_US
dc.subjectFerroelectric capacitorsen_US
dc.subjectFerroelectric thin filmsen_US
dc.subjectPlatinumen_US
dc.subjectStrontium compoundsen_US
dc.subjectTunnellingen_US
dc.titleVanishing critical thickness in asymmetric ferroelectric tunnel junctions : first principle simulationsen_US
dc.typeJournal/Magazine Articleen_US
dc.description.otherinformationAuthor name used in this publication: C. H. Wooen_US
dc.identifier.spage1-
dc.identifier.epage6-
dc.identifier.volume109-
dc.identifier.issue2-
dc.identifier.doi10.1063/1.3532000-
dcterms.abstractThe stability of the remnant polarization in the ferroelectric barrier layer is a prerequisite to applications involving ferroelectric tunnel junctions (FTJs) or capacitors. One of the most important issues in the pursuit of further developments in this area is to overcome the limitations due to the critical thickness, below which the ferroelectric polarization disappears. In this paper we report first-principle density-functional calculations of the charge distribution and polarization in an asymmetric FTJ (A-FTJ), i.e., one with dissimilar electrodes. We found that a significant and stable polarization can be retained down to thicknesses as small as 0.8 nm two unit-cells in a BaTiO₃thin film between Pt and SrRuO₃electrodes, quite unlike the case of symmetric FTJs. We trace this surprising result to the large electric field produced by the charge transfer between the electrodes caused by their different electronic environments, which acts against the depolarization field and enhances the ferroelectricity, leading to the reduction, or even the complete elimination of the depolarization field, leading to the vanishing of the critical thickness. We speculate that this is a general result for A-FTJs, which could be of importance to applications of ferroelectric thin films and tunneling junctions or capacitors where the presence of the critical thickness is a limiting factor.-
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of applied physics, 15 Jan. 2011, v. 109, no. 2, 024103, p. 1-6-
dcterms.isPartOfJournal of applied physics-
dcterms.issued2011-01-15-
dc.identifier.isiWOS:000286896400076-
dc.identifier.scopus2-s2.0-79551677535-
dc.identifier.eissn1089-7550-
dc.identifier.rosgroupidr55225-
dc.description.ros2010-2011 > Academic research: refereed > Publication in refereed journal-
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumberOA_IR/PIRAen_US
dc.description.pubStatusPublisheden_US
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