Journal ArticleDOI
Analysis of Switching in Perovskite Ferroelectrics on the Tetragonal Side of the Morphotropic Phase Boundary Using a Landau-Theory-Based Lattice Model with Polarization Vector Rotations
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TLDR
In this paper, the polarization reversal in perovskite ferroelectrics having a tetragonal phase was studied using the Landau-theory-based lattice model, extended to the three-dimensional polarization case.Abstract:
The polarization reversal in perovskite ferroelectrics having a tetragonal phase is studied using the Landau-theory-based lattice model, extended to the three-dimensional polarization case. Switching at various electric field levels is analyzed for near and far distances from the theoretical morphotropic phase boundary (MPB), in the presence of the latent nuclei. The calculated time dependence of average polarization during switching is correlated with the changes of polarization profiles in the lattice. For low electric fields, switching can be achieved by polarization vector rotations triggered by infinitesimal tilting at the latent nuclei sites. Polarization vector rotations are most significant close to the MPB, where the free energy is isotropic in the space spanned by the polarization components. For electric fields beyond the longitudinal polarization instability, the transversal polarization components do not play a very significant role. Inferior retention properties near the MPB due to the polarization vector rotations are predicted, though higher reversal speed and lower switching threshold are expected.read more
Citations
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Recent Applications of Landau-Ginzburg Theory to Ferroelectric Superlattices: A Review
TL;DR: In this article, a review of recent developments of Landau-Ginzburg theory to ferroelectric phase transitions in superlattices is presented, which describes the formation of intermixed layer with properties different from those of both layers.
Journal ArticleDOI
Influence of dielectric stiffness, interface, and layer thickness on hysteresis loops of ferroelectric superlattices
TL;DR: In this article, the influence of dielectric stiffness, interface, and layer thickness on the hysteresis loops, including the remanent polarization and coercive field of a superlattice comprising alternate layers of ferroelectric and dielectrics, using the Landau-Ginzburg theory.
Journal ArticleDOI
Ferroelectric system dynamics simulated by a second-order Landau model
TL;DR: In this paper, a second-order time-dependent Ginzburg-Landau model was used to simulate the dynamic polarization hysteresis behavior of a ferroelectric system subjected to a sinusoidal electric field.
Journal ArticleDOI
Symplectic integration approach for metastable systems
TL;DR: In this article, Shiino et al. described nonadiabatic behavior of metastable systems modeled by anharmonic Hamiltonians and reproduced by the Fokker-Planck and imaginary time Schrodinger equation with subsequent symplectic integration.
Journal ArticleDOI
Simulation of nonlinear ferroelectric characteristics in the extended dipole lattice model
TL;DR: In this article, the authors simulate some nonlinear equilibrium and nonequilibrium properties in ferroelectric thin films: the static and dynamics of domain walls, polarization switching, hysteresis loops, switching current and kinetics of phase transitions taking into account the finite-size effects.
References
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Journal ArticleDOI
Breaking chirality in nonequilibrium systems
TL;DR: It is shown that when Bloch walls become chiral, they move with a velocity simply related to their chirality, which is a straightforward consequence of nonvariational effects, which are typical of nonequilibrium systems.
Journal ArticleDOI
Retention Characteristics of a Ferroelectric Memory Based on SrBi2(Ta, Nb)2O9
TL;DR: In this paper, the polarization decay process in SrBi 2 (Ta, Nb) 2 O 9 capacitors and retention characteristics of a 288-bit Ferroelectric memory were studied.