Vilgelmina Stepkova

Creation, annihilation and transport of nonmagnetic antiskyrmions within Ginzburg–Landau–Devonshire model

Vilgelmina Stepkova, J. Hlinka

Atomistic model calculations recently revealed that the polarization pattern at the cross section through nanoscale ferroelectric nanodomains in rhombohedral barium titanate shows a clear antiskyrmion attributes such as the net invariant topological charge of minus two. The present work confirms that these …

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Creation, annihilation and transport of nonmagnetic antiskyrmions within Ginzburg-Landau-Devonshire model

Vilgelmina Stepkova, J. Hlinka

Atomistic model calculations recently revealed that the polarization pattern at the cross-section through nanoscale ferroelectric nanodomains in rhombohedral barium titanate shows a clear antiskyrmion attributes such as the net invariant topological charge of minus two. The present work confirms that these topological …

Fundamental Properties of Ferroelectric Domain Walls from Ginzburg–Landau Models

P. Ondrejkovič, Pavel Márton, Vilgelmina Stepkova, J. Hlinka

This chapter discusses the contemporary possibilities, prospects, and limitations of phase-field simulations and Ginzburg-Landau-Devonshire models of DWs. It focuses on the most studied ferroelectric oxides BaTiO3, KNbO3, PbTiO3, as well as in various complex perovskite oxides like lead zirconate titanate (PZT) and …

Pinning of a ferroelectric Bloch wall at a paraelectric layer

Vilgelmina Stepkova, J. Hlinka

crystalline superlattices performed in this study suggest that a paraelectric layer with a thickness comparable to the thickness of the domain wall itself can act as an efficient pinning layer. At the same time, such a layer facilitates the possibility to switch …

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On the possible internal structure of the ferroelectric Ising lines in BaTiO3

Vilgelmina Stepkova, J. Hlinka

This article is devoted to a detailed analysis of the inner structure of the Ising line, a topological defect separating two parts of a ferroelectric Bloch domain wall with opposite helicity, in the framework of the phenomenological Ginzburg–Landau–Devonshire model. Results performed for …

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Ferroelectric Domain Walls and their Intersections in Phase-Field Simulations

J. Hlinka, Vilgelmina Stepkova, Pavel Márton, P. Ondrejkovič

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Ising lines: Natural topological defects within ferroelectric Bloch walls

Vilgelmina Stepkova, Pavel Márton, J. Hlinka

Phase-field simulations demonstrate that the polarization order-parameter field in the Ginzburg-Landau-Devonshire model of rhombohedral ferroelectric ${\mathrm{BaTiO}}_{3}$ allows for an interesting linear defect, stable under simple periodic boundary conditions. This linear defect, here called the Ising line, can be described as an about …

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Peculiar domain states of cylindrical BaTiO3nanorods embedded in SrTiO3matrix

Vilgelmina Stepkova, Pavel Márton, J. Hlinka

Recent analysis based on the generalized Ginzburg–Landau–Devonshire model and phase-field approach predicts the formation of a simple quadruplet domain configuration in BaTiO3 nanorods embedded in epitaxial SrTiO3 film. This quadruplet configuration can have three inequivalent variants, differing by the arrangement of the …

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Closed-circuit domain quadruplets in BaTiO 3 nanorods embedded in a SrTiO 3 film

Vilgelmina Stepkova, Pavel Márton, N. Setter, J. Hlinka

Cylindrical BaTiO${}_{3}$ nanorods embedded in $\ensuremath{\langle}100\ensuremath{\rangle}$-oriented SrTiO${}_{3}$ epitaxial film in a brushlike configuration are investigated in the framework of the Ginzburg-Landau-Devonshire model. It is shown that strain compatibility at BaTiO${}_{3}$/SrTiO${}_{3}$ interfaces keeps BaTiO${}_{3}$ nanorods in the rhombohedral phase even at room temperature. …

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Divergence of dielectric permittivity near phase transition within ferroelectric domain boundaries

Pavel Márton, Vilgelmina Stepkova, J. Hlinka

Phase-field simulations based on Ginzburg–Landau–Devonshire model were utilised to demonstrate and quantify the enhancement of the dielectric permittivity of multidomain rhombohedral BaTiO3 crystal in the vicinity of the Bloch-type to Ising-type phase transition within 180° domain boundaries with crystallographic orientation. The phase …

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Bloch-type domain walls in rhombohedral BaTiO 3

Maryam Taherinejad, David Vanderbilt, Pavel Márton, Vilgelmina Stepkova et autres

Ferroelectric domain walls (FDWs) are usually considered to be of Ising type, but there have been suggestions in recent years that Bloch-type FDWs are also possible in some cases, e.g., in the rhombohedral phase of BaTiO${}_{3}$. The mechanically compatible and electrically neutral …

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Stress-induced phase transition in ferroelectric domain walls of BaTiO3

Vilgelmina Stepkova, Pavel Márton, J. Hlinka

The seminal paper by Zhirnov (1958 Zh. Eksp. Teor. Fiz. 35 1175-80) explained why the structure of domain walls in ferroelectrics and ferromagnets is drastically different. Here we show that the antiparallel ferroelectric walls in rhombohedral ferroelectric BaTiO(3) can be switched between …

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