Physics of thin-film ferroelectric oxides

Dawber, Matthew; Rabe, Karin M.; Scott, J. F.

doi:10.1103/revmodphys.77.1083

Cited by 2,004 publications

(1,413 citation statements)

References 365 publications

(279 reference statements)

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“…Polar solids crystallizing in a perovskite structure have received much interest because of their particular structural and electronic properties [1][2][3][4][5]. Electronic and/or spin correlations in such materials give rise to charge ordering, ferroelectricity, superconductivity, ferromagnetism and other phenomena.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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Femtosecond x-ray diffraction provides direct insight into the ultrafast reversible lattice dynamics of materials with a perovskite structure. Superlattice (SL) structures consisting of a sequence of nanometer-thick layer pairs allow for optically inducing a tailored stress profile that drives the lattice motions and for limiting the influence of strain propagation on the observed dynamics. We demonstrate this concept in a series of diffraction experiments with femtosecond time resolution, giving detailed information on the ultrafast lattice dynamics of ferroelectric and ferromagnetic superlattices. Anharmonically coupled lattice motions in a SrRuO 3 /PbZr 0.2 Ti 0.8 O 3 (SRO/PZT) SL lead to a switch-off of the electric polarizations on a time scale of the order of 1 ps. Ultrafast magnetostriction of photoexcited SRO layers is demonstrated in a SRO/SrTiO 3 (STO) SL.

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Section: Introductionmentioning

confidence: 99%

Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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“…Readers may find it useful to additionally consult other complementary reviews on the topic [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Ferroelectrics at the nanoscale

Gregg¹

2009

Physica Status Solidi (a)

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There are several factors which make the investigation and understanding of nanoscale ferroelectrics particularly timely and important. Firstly, there is a market pressure, primarily from the electronics industry, to integrate ferroelectrics into devices with progressive decreases in size and increases in morphological complexity. This is perhaps best illustrated through the roadmaps for product development in FeRAM (Ferroelectric Random Access Memory) where the need for increases in bit density will require a move from 2D planar capacitor structures to 3D trenched capacitors in the next few years. Secondly, there is opportunity for novel exploration, as it is only relatively recently that developments in thin film growth of complex oxides, self‐assembly techniques and high‐resolution ‘top–down’ patterning have converged to allow the fabrication of isolated and well‐defined ferroelectric nanoshapes, the properties of which are not known. Thirdly, there is an expectation that the behaviour of small scale ferroelectrics will be different from bulk, as this group of functional materials is highly sensitive to boundary/surface conditions, which are expected to dominate the overall response when sizes are reduced into the nanoscale regime.This feature article attempts to introduce some of the current areas of discovery and debate surrounding studies on ferroelectrics at the nanoscale. The focus is directed primarily at the search for novel size‐related properties and behaviour which are not necessarily observed in bulk. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…Although miniaturization and nanoscaling have led to effects that modify the ferroelectric behavior, the latter still requires improved fundamental understanding in the reduced dimensions. 1 In particular for epitaxial ferroelectrics, the misfit strain largely affects the behavior and properties of the thin films. [2][3][4][5] Several theoretical models were developed, predicting the effect of substrate constraints on domain structures in ferroelectric films.…”

Section: Introductionmentioning

confidence: 99%

Monodomain strained ferroelectricPbTiO3thin films: Phase transition and critical thickness study

Venkatesan

Vlooswijk²,

Kooi

et al. 2008

Phys. Rev. B

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This work demonstrates that instead of paraelectric PbTiO 3 , completely c-oriented ferroelectric PbTiO 3 thin films were directly grown on ͑001͒-SrTiO 3 substrates by pulsed-laser deposition with thickness up to 340 nm at a temperature well above the Curie temperature of bulk PbTiO 3 . The influence of laser-pulse frequency, substrate-surface termination on growth, and functional properties were studied using x-ray diffraction, transmission electron microscopy, and piezoresponse force microscopy. At low growth rates ͑frequency Ͻ5 Hz͒ the films were always monodomain. However, at higher growth rates ͑frequency Ͼ8 Hz͒ a domains were formed for film thickness above 20-100 nm. Due to coherency strains the Curie temperature ͑T c ͒ of the monodomain films was increased approximately by 350°C with respect to the T c of bulk PbTiO 3 even for 280-nm-thick films. Nonetheless, up to now this type of growth mode has been considered unlikely to occur since the Matthews-Blakeslee ͑MB͒ model already predicts strain relaxation for films having a thickness of only ϳ10 nm. However, the present work disputes the applicability of the MB model. It clarifies the physical reasons for the large increase in T c for thick films, and it is shown that the experimental results are in good agreement with the predictions based on the monodomain model of Pertsev et al. ͓Phys. Rev. Lett. 80, 1988

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Physics of thin-film ferroelectric oxides

Cited by 2,004 publications

References 365 publications

Ultrafast structural dynamics of perovskite superlattices

Ultrafast structural dynamics of perovskite superlattices

Ferroelectrics at the nanoscale

Monodomain strained ferroelectricPbTiO3thin films: Phase transition and critical thickness study

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