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arXiv · 1406.7548

Polar Properties and Hysteresis Loops in Multilayered Thin Films Ferroelectric/Virtual Ferroelectric

E. A. Eliseev·M. D. Glinchuk·A. N. Morozovska·Ya. V. Yakovenko
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Abstract

In the framework of Landau--Ginzburg--Devonshire (LGD) phenomenological theory, the influence of misfit strains, surface energy, and finite-size effects on phase diagrams, polar properties, and hysteresis loops has been calculated for multilayered thin films of the type ferroelectric/virtual ferroelectric. The influence of elastic deformations that arise at the interface thin film--substrate owing to a mismatch between the lattice constants in the film and the substrate on the phase diagrams of multilayered thin films virtual ferroelectric SrTiO$_{3}$/ferroelectric BaTiO$_{3}$ has been studied for the first time. In contrast to bulk BaTiO$_{3}$, in which only four phases (cubic, tetragonal, orthorhombic, and rhombohedral) can exist, it turned out that six thermodynamically stable BaTiO$_{3}$ phases (paraelectric phase and tetragonal (FEc), two monoclinic (FEaac and FEac), and two orthorhombic (FEa and FEaa) ferroelectric phases) can exist in multilayered SrTiO$_{3}$/BaTiO$_{3}$ films. The main polar properties of hysteresis loops (shape, coercive field, and spontaneous polarization) in thin multilayered SrTiO$_{3}$/BaTiO$_{3}$ films are calculated. It is shown that the system demonstrates a strong dependence of its polar properties on the thickness of SrTiO$_{3}$ and BaTiO$_{3}$ layers, as well as on the elastic misfit strains, with SrTiO$_{3}$ playing the role of dielectric layer: the thicker the layer, the stronger is the depolarization field, which, in its turn, reduces the spontaneous polarization in the BaTiO$_{3}$ film.

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E. A. Eliseev, M. D. Glinchuk, A. N. Morozovska, Ya. V. Yakovenko. 2014-06-29. Polar Properties and Hysteresis Loops in Multilayered Thin Films Ferroelectric/Virtual Ferroelectric. https://arxiv.org/abs/1406.7548

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