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28 Dec 2009

Volume 95, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 95, 261901 (2009); http://dx.doi.org/10.1063/1.3268436 (3 pages)

Weiqiang Wang, Richard Clark, Aiichiro Nakano, Rajiv K. Kalia, and Priya Vashishta
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Surface and size effects on phase diagrams of ferroelectric thin films

D. C. Ma, Yue Zheng, and C. H. Woo

Appl. Phys. Lett. 95, 262901 (2009); http://dx.doi.org/10.1063/1.3272942 (3 pages) | Cited 6 times

Online Publication Date: 28 December 2009

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Taking into account effects of the surface and depolarization field, we investigated the “misfit strain-temperature” phase diagrams of ferroelectric thin film by using the time-dependent Ginzburg–Landau theory. The simulation results show that the surface effect can shift the phase diagram to lower temperature. More importantly, effect of the depolarization field obviously shrinks the c-phase, and dominates the paraelectric and aa-phase in the phase diagram.
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81.30.Dz Phase diagrams of other materials
77.80.-e Ferroelectricity and antiferroelectricity

Electric-field-controlled directional motion of ferroelectric domain walls in multiferroic BiFeO3 films

T. H. Kim (김태헌), S. H. Baek, S. M. Yang, S. Y. Jang, D. Ortiz, T. K. Song, J.-S. Chung, C. B. Eom, T. W. Noh, and J.-G. Yoon

Appl. Phys. Lett. 95, 262902 (2009); http://dx.doi.org/10.1063/1.3275736 (3 pages) | Cited 8 times

Online Publication Date: 31 December 2009

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We describe the directional ferroelectric domain wall motion in a multiferroic BiFeO3 thin film, which was grown epitaxially on a vicinal (001) SrTiO3 substrate. A structural analysis of the film shows that a strain gradient is developed in our film, which creates a symmetry breaking in a ferroelectric double-well potential. The asymmetric double-well potential can cause ferroelectric domain walls to move sideways with preferred directionality under a vertical electric field. Our results suggest the possibility of controlling the direction of domain growth with an electric field by imposing constraints on ferroelectric films, such as a strain gradient.
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77.80.Dj Domain structure; hysteresis
77.55.fp Other ferroelectric films
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
75.85.+t Magnetoelectric effects, multiferroics
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