Correlation Between Structure And C-Afm Contrast Of 180-Degree Domain Walls In Rhombohedral Bati03

Abstract

Using Landau-Ginzburg-Devonshire theory we describe 180-degree domain wall structure, intrinsic energy and carrier accumulation in rhombohedral phase of BaTiO3 as a function of the wall orientation and flexoelectric coupling strength. Two types of domain wall structures (phases of the wall) exist depending on the wall orientation. The low-energy 'achiral' phase occurs in the vicinity of the {110} wall orientation and has odd polarization profile invariant with respect to inversion about the wall center. The second 'chiral' phase occurs around {211} wall orientations and corresponds to mixed parity domain walls that may be of left-handed or right-handed chirality. The transformation between the phases is abrupt, accompanied with 20-30% change of the domain wall thickness and can happen at fixed wall orientation with temperature change. We suggest that the phase transition may be detected through domain wall thickness change or by c-AFM. The structure of the domain wall is correlated to its conductivity through polarization component normal to the domain wall, which causes free carriers accumulation. Depending on the temperature and flexoelectric coupling strength relative conductivity of the wall becomes at least one order of magnitude higher than in the single-domain region, creating c-AFM contrast enhancement pronounced and detectable.

arXiv comment31 pages, 10 figures, Supplementary materials

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• 180 degree Ferroelectric Stripe Nanodomains in BiFeO3 Thin Films
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• Flexocoupling impact on the generalized susceptibility and soft phonon modes in the ordered phase of ferroics
• Electric Field Control of Three-Dimensional Vortex States in Core-Shell Ferroelectric Nanoparticles
• Chiral Polarization Textures Induced by the Flexoelectric Effect in Ferroelectric Nanocylinders
• Ising lines: natural topological defects within chiral ferroelectric domain walls
• Nanoscale periodic domain patterns in tetragonal ferroelectrics: A phase-field study
• Flexo-Sensitive Polarization Vortices in Thin Ferroelectric Films
• From bulk descriptions to emergent interfaces: connecting the Ginzburg-Landau and elastic line models
• Non-Ising domain walls in c-phase ferroelectric lead titanate thin films
• Hidden Symmetry of Flexoelectric Coupling
• Flexocoupling impact on the kinetics of polarization reversal
• Spontaneous symmetry breaking of domain walls in phase-competing regions
• Numerical Discretization of Variational Phase Field Model for Phase Transitions in Ferroelectric Thin Films
• Flexoelectricity induced spatially modulated phases in ferroics and liquid crystals (Author review)