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PHASE FIELD STUDY OF POLARIZATION VORTEX IN ferroelectric nanostructures

Journal of Advanced Dielectrics 2012年第2期2卷 50-62页

作者： JIE WANG TONG-YI ZHANG Department of Engineering Mechanics Zhejiang University HangzhouP.R.China Department of Mechanical Engineering Hong Kong University of Science&Technology Clear Water Bay Hong KongP.R.China

ferroelectric nanostructures are attracting considerable attention due to their unusual physical properties and potential applications in memory devices and nanoelectromechanical *** has been found that low-dimensional ferroelectrics,such as ferroelectric nanodots,ferroelectric nanotubes and ferroelectric thinfilms,exhibit polarization vortices or vortex-like domain structures due to the strong depolarizationfield and the size *** polarization vortex is regarded as a new toroidal order in ferroelectrics which is different from the rectilinear order of *** vortex states of polarization are bistable and can be switched from one state to the other,which holds the potential application in next generation ferroelectric *** paper brie°y reviews the recent work on the phasefield studies of polarization vortex in ferroelectric nanos*** homogeneous bulk thermodynamics of ferroelectrics isfirst introduced based on the LandauDevonshire *** describe the inhomogeneous polarization distribution in ferroelectrics,the phasefield model including interface thermodynamics is then presented in the form of time-dependent GinzburgLandau equations.

关键词： Polarization vortex phasefield model ferroelectric nanostructures

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SIZE EFFECTS IN PEROVSKITE ferroelectric nanostructures:CURRENT PROGRESS AND FUTURE PERSPECTIVES

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Journal of Advanced Dielectrics 2011年第3期1卷 289-301页

作者： XINHUA ZHU ZHIGUO LIU National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing 210093P.R.China National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University Nanjing 210093P.R.China

Perovskite ferroelectric nanostructures offer a wide range of functional properties(e.g.,dielectric switchability,piezoelectricity,pyroelectricity,high permittivities and strong electro-optic effects),which have received much attention in theelds of microelectronic devices miniaturization over the last few *** size effects of the functional properties have been demonstrated in the perovskite ferroelectric *** its intrinsic scientic value,fundamental understanding of the size effects in perovskite ferroelectric nanostructures has become critical item for developing a new generation of revolutionary *** this article,a comprehensive review of the state-of-the-art research progress on the size effects in perovskite ferroelectric nanostructures which have been achieved from both experiment and theory is *** begins with a historical perspective of the size effects in perovskite ferroelectrics,and then highlight the recent progress on the theoretical studies of the size effects in perovskite ferroelectric nanostructures which have been achieved by using different numerical approaches(e.g.,phenomenological approaches,rst-principle computations and the Ising model in a transverseeld).The current progress of the experimental testing of the size effects in perovskite ferroelectric nanostructures(e.g.,nanoparticles,nanowires,nanotubes and nanolms)is ***,the perspectives toward the future challenges of the size effects in perovskite ferroelectric nanostructures is reviewed.

关键词： Size effects perovskite oxides ferroelectric nanostructures

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Phase field study of polarization vortex in ferroelectric nonostructures

Phase field study of polarization vortex in ferroelectric no...

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2011年全国压电和声波理论及器件应用研讨会

作者： Jie WANG Department of Engineering Mechanics,Zhejiang University,Hangzhou 310027

＜正＞ferroelectric nanostructures are attracting considerable attention due to their unusual physical properties and potential applications in memory devices and nanoelectromechanical systems（NEMS）.Low dimensional ... 详细信息

关键词： Polarization vortex ferroelectric nanostructures Phase field model

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