Scaling of the coercive field in ferroelectrics at the nanoscale

Gaynutdinov, R. V.; Minnekaev, M.; Mitko, S.; Толстихина, А. Л.; Zenkevich, A.; Ducharme, Stephen; Fridkin, V. M.

doi:10.1134/s0021364013190041

Cited by 9 publications

(11 citation statements)

References 19 publications

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“…It is worth noting that the obtained values of E pv for both thicknesses of BaTiO 3 are less than the corresponding coercive field E c . It is because, unlike bulk crystals, the previously obtained values of E c for ultrathin BaTiO 3 films [30,31] are very close to the intrinsic Landau-Ginzburg value E c ∼ 10 6 V/cm for BaTiO 3 [31].…”

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confidence: 60%

Giant bulk photovoltaic effect in thin ferroelectricBaTiO3films

et al. 2014

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The voltage generated in a noncentrosymmetric crystal due to the bulk photovoltaic effect (BPE) can greatly exceed the energy gap, however, the light energy conversion efficiency is extremely low. Here we show that the BPE is remarkably enhanced in the case of thin films. The measurements of the BPE in heteroepitaxial single domain ferroelectric BaTiO 3 thin films reveal the enhancement of both photoinduced electric field and conversion efficiencies of the BPE by more than 4 orders of magnitude. Besides the fundamental aspect, our results indicate the potential for the use of the BPE in photovoltaic applications.

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confidence: 60%

Giant bulk photovoltaic effect in thin ferroelectricBaTiO3films

et al. 2014

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“…Here, for the first time, a scaling behavior of the same type is reported for nanoscale barium titanate films grown by laser epitaxy [38].Measurements were performed on aPt-BaTiO 3 -Au capacitor using PAM (see Figure 4). Electrodes were formed on a barium titanate surface by lithography and were circular with a radius of a few micrometers.…”

Section: Coercive Field Scalingmentioning

confidence: 56%

Ferroelectricity at the nanoscale

Fridkin

Ducharme

2014

Phys.-Usp.

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The properties of ferroelectrics at the nanoscale are reviewed. The term nanoscale is here related to the ferroelectric film thickness (which is by an order of magnitude the size of the critical domain nucleus). The three aspects considered are ferroelectric switching, the scaling of the coercive field, and the bulk photovoltaic effect. While ferroelectricity at the nanoscale has a twenty-year history of study, it is only in the last few years that perovskite ferroelectric films have become a focus of interest.

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“…The experiments concluded that in BaTiO 3 films of 20-nm thickness, the coercive field is around 70 KV mm −1 [42]. Hence, for the ideal crystal, in order to recognize the physical phenomena clearly it is essential to apply a very high external field in the simulation for the sample with size 25.2 nm 2 .…”

Section: B Electrocaloric Effect Of Batiomentioning

confidence: 98%

“…Hence, when the domain-wall energy is sufficiently small (S J = 1), an antiferroelectric-type hysteresis is visible. According to the measurements by Gaynutdinov et al [42], the coercive field is around 70 KV mm −1 for BaTiO 3 thin films with a thickness of 20 nm. The simulated sample size is 25.2 nm 2 in this work, and for S J = 2 the coercive field is about 120 KV mm −1 , which is in good agreement to the experimental value.…”

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confidence: 95%

Lattice-based Monte Carlo simulations of the electrocaloric effect in ferroelectrics and relaxor ferroelectrics

Albe

2015

Phys. Rev. B

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Canonical and microcanonical Monte Carlo simulations are carried out to study the electrocaloric effect (ECE) in ferroelectrics and relaxor ferroelectrics (RFEs) by direct computation of field-induced temperature variations at the ferroelectric-to-paraelectric phase transition and the nonergodic-to-ergodic state transformation. A lattice-based Hamiltonian is introduced, which includes a thermal energy, a Landau-type term, a dipole-dipole interaction energy, a gradient term representing the domain-wall energy, and an electrostatic energy contribution describing the coupling to external and random fields. The model is first parametrized and studied for the case of BaTiO 3 . Then, the ECE in RFEs is investigated, with particular focus on the influence of random fields and domain-wall energies. If the strength or the density of the random fields increases, the ECE peak shifts to a lower temperature but the temperature variation is reduced. On the contrary, if the domain-wall energy increases, the peak shifts to a higher temperature and the ECE becomes stronger. In RFEs, the ECE is maximum at the freezing temperature where the nonergodic-to-ergodic transition takes place. Our results imply that the presence of random fields reduces the entropy variation in an ECE cycle by pinning local polarization.

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Scaling of the coercive field in ferroelectrics at the nanoscale

Abstract: Gaynutdinov, R. V.; Minnekaev, M.; Mitko, S.; Tolstikhina, A. L.; Zenkevich, A.; Ducharme, Stephen; and Fridkin, Vladimir M., "Scaling of the Coercive Field in Ferroelectrics at the Nanoscale" (2013). Stephen Ducharme Publications. 91.

Cited by 9 publications

References 19 publications

Giant bulk photovoltaic effect in thin ferroelectricBaTiO3films

Giant bulk photovoltaic effect in thin ferroelectricBaTiO3films

Ferroelectricity at the nanoscale

Lattice-based Monte Carlo simulations of the electrocaloric effect in ferroelectrics and relaxor ferroelectrics

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