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Depolarizing field and "real" hysteresis loops in nanometer-scale ferroelectric films

Depolarizing field and "real" hysteresis loops in nanometer-scale ferroelectric films,A. M. Bratkovsky,A. P. Levanyuk

Depolarizing field and "real" hysteresis loops in nanometer-scale ferroelectric films   (Citations: 2)
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We give detailed analysis of the effect of depolarizing field in nanometer-size ferroelectric capacitors studied by Kim et al. [Phys. Rev. Lett. 95, 237602 (2005)]. We calculate a critical thickness of the homogeneous state and its stability with respect to domain formation for strained thin films of BaTiO3 on SrRuO3/SrTiO3 substrate within the Landau theory. While the former (2.5nm) is the same as given by ab-initio calculations, the actual critical thickness is set by the domains at 1.6nm. There is a large Merz's activation field for polarization relaxation. Remarkably, the results show a_negative_ slope of the "actual" hysteresis loops, a hallmark of the domain structures in ideal thin films with imperfect screening.
Published in 2006.
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