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• W2060784703 startingPage "092906" @default.
• W2060784703 abstract "Vortices consisting of 90° quadrant domains are rarely observed in ferroelectrics. Although experiments show polarization flux closures with stripe domains, it is as yet unclear why pure single vortices are not commonly observed. Here, we model and explore the energy of polarization patterns with vortex and stripe domains, formed on the square cross-section of a barium titanate nanowire. Using phase-field simulations, we calculate the associated energy of polarization patterns as a function of nanowire width. Further, we demonstrate the effects of surface energy and electrical boundary conditions on equilibrium polarization patterns. The minimum energy equilibrium polarization pattern for each combination of surface energy and nanowire width is mapped for both open- and short-circuit boundary conditions. The results indicate a narrow range of conditions where single vortices are energetically favorable: nanowire widths less than about 30 nm, open-circuit boundary condition, and surface energy of less than 4 N/m. Short-circuit boundary conditions tend to favor the formation of a monodomain, while surface energy greater than 4 N/m can lead to the formation of complex domain patterns or loss of ferroelectricity. The length scale at which a polarization vortex is energetically favorable is smaller than the typical size of nanoparticle in recent experimental studies. The present work provides insight into the effects of scaling, surface energy, and electrical boundary conditions on the formation of polarization patterns." @default.
• W2060784703 created "2016-06-24" @default.
• W2060784703 creator A5013893618 @default.
• W2060784703 creator A5072784665 @default.
• W2060784703 date "2015-03-02" @default.
• W2060784703 modified "2023-10-17" @default.
• W2060784703 title "Scale effects and the formation of polarization vortices in tetragonal ferroelectrics" @default.
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• W2060784703 doi "https://doi.org/10.1063/1.4913917" @default.
• W2060784703 hasPublicationYear "2015" @default.
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