Surface and size effects on phase diagrams of ferroelectric nanocylinders

Zheng, Yue; Lin, Shaopeng; Wang, Biao

doi:10.1063/1.3624829

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…[1][2][3][4][5][6][7] Particularly, due to effects of size, surface, and interface, ferroelectric nanostructures may be quite different in property from their bulk counterparts. [8][9][10][11][12][13] The small size, high surface-volume ratio, and inherent functional properties of ferroelectric nanostructures are important in developing functional nanodevices and device miniaturization. Currently, ferroelectric nanostructures can be experimentally prepared by various synthesis methods, and have been reported in a large amount of papers in order to utilize them in nanodevices.…”

Section: Introductionmentioning

confidence: 99%

Effects of the surface charge screening and temperature on the vortex domain patterns of ferroelectric nanodots

Chen

Woo

et al. 2012

Journal of Applied Physics

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Based on the phase field simulations, effects of the surface charge screening and temperature on the vortex domain structure of the ferroelectric nanodot have been investigated. Our calculations show that the ferroelectric nanodot adopts a rhombohedral vortex domain pattern under an ideal open-circuit boundary condition. With the increase of the surface charge screening, the dipole vortex gradually rotates and appears rhombohedral-orthorhombic-tetragonal transformation. By adjusting the surface charge screening, the polar single domain and multi-vortices domain patterns with zero toroidal moment have been obtained near the phase transition temperature. More importantly, temperature and charge screening "T-C" phase diagram has been summarized, which indicates an effective method to control the vortex domain structure in the low-dimensional ferroelectric nanostructures. V C 2012 American Institute of Physics. [http://dx

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Section: Introductionmentioning

confidence: 99%

Effects of the surface charge screening and temperature on the vortex domain patterns of ferroelectric nanodots

Chen

Woo

et al. 2012

Journal of Applied Physics

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Ab initio study on the size effect of symmetric and asymmetric ferroelectric tunnel junctions: A comprehensive picture with regard to the details of electrode/ferroelectric interfaces

Chen

Zheng

Luo

et al. 2013

Journal of Applied Physics

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Ferroelectric size effect of BaTiO3 (BTO) tunnel junctions with metal Pt and/or oxide SrRuO3 (SRO) electrodes has been comprehensively investigated by the first-principle calculations. A vacuum layer is included in the supercell calculations, so that full-relaxation is achieved without artificial constraint on the supercell strains. We have constructed all of ten possible types of tunnel junctions with either symmetric or asymmetric geometries to systematically explore the influence of electrode/ferroelectric interfaces. The characteristics of atomic structure, polarization, charge density, and electrostatic potential for different geometries and sizes are revealed. It is found that the ferroelectric stability of a tunnel junction depends significantly on the details of the two electrode/ferroelectric interfaces, which present specific short- and long-range properties, e.g., local bonding environment, electronic screening, built-in field, etc. Result shows that Pt/BTO interfaces have strong coupling with ferroelectric distortion and thus play more dominant roles than the SRO/BTO interfaces in affecting the ferroelectric stability of the tunnel junctions. Particularly, it is found that Pt2/TiO2 interface can induce collective ferroelectric distortion in the initially non-distorted barrier. With a full-relaxation of the strains, an abnormal enhancement of ferroelectricity by Pt2/BaO interface due to Pt-O bonding effect is demonstrated, where a strong interfacial-bonding-related polarizing field is verified. Also importantly, polarization stability of asymmetric tunnel junctions is found dependent on direction, manifested with the appearing of a new critical thickness, below which the tunnel junction loses polarization bistability. Furthermore, it shows that the local features of a specific electrode/ferroelectric interface (e.g., the interfacial atomic structure, local polarization, charge transfer, and potential step) are well kept in different types of tunnel junctions. By analyzing and summarizing the results, our results suggest that traditional phenomenological models need several modifications in order to quantitatively reproduce the size effect of ferroelectric tunnel junctions. Our study provides a comprehensive picture of the ferroelectric size effect in BTO tunnel junctions as a function of electrode/ferroelectric interfaces and should have valuable implications for future studies and applications.

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Surface and size effects on phase diagrams of ferroelectric nanocylinders

Cited by 2 publications

References 22 publications

Effects of the surface charge screening and temperature on the vortex domain patterns of ferroelectric nanodots

Effects of the surface charge screening and temperature on the vortex domain patterns of ferroelectric nanodots

Ab initio study on the size effect of symmetric and asymmetric ferroelectric tunnel junctions: A comprehensive picture with regard to the details of electrode/ferroelectric interfaces

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