Wedgelike ultrathin epitaxial BaTiO3 films for studies of scaling effects in ferroelectrics

Petraru, A.; Waser, R.; Poppe, U.; Schubert, J.; Pertsev, N. A.; Zander, W.; Solbach, A.; Klemradt, U.; Kohlstedt, H.

doi:10.1063/1.2972135

Journal Article

Wedgelike ultrathin epitaxial BaTiO3 films for studies of scaling effects in ferroelectrics

Petraru, A.FZJ* ; Kohlstedt, H.FZJ* ; Poppe, U.FZJ* ; Waser, R.FZJ* ; Solbach, A. ; Klemradt, U. ; Schubert, J.FZJ* ; Zander, W.FZJ* ; Pertsev, N. A.

2008
American Institute of Physics Melville, NY

Applied physics letters 93, 072902 (2008) [10.1063/1.2972135]

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Please use a persistent id in citations: http://hdl.handle.net/2128/17138 doi:10.1063/1.2972135

Abstract: To study ferroelectric size effects in heteroepitaxial SrRuO3/BaTiO3/SrRuO3 capacitors, ultrathin BaTiO3 layers were deposited in wedge form across SrTiO3 substrates. The wedgelike films were fabricated by using either an off-center substrate-target geometry or via a moveable shutter during high-pressure sputter deposition. The crystallinity, composition, and surface roughness along wedgelike BaTiO3 films were verified by x-ray diffraction, Rutherford backscattering spectrometry, and atomic force microscopy, respectively. The electrical measurements performed at 77 K showed that, despite progressive reduction in remanent polarization as the film thickness decreases even the 3.5-nm-thick BaTiO3 film retains a large remanent polarization of 28 mu C/cm(2). (C) 2008 American Institute of Physics.

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Classification:

Physics, Applied

Note: The authors wish to thank M. Hambe for helpful suggestions. The financial support of Hasylab through project II-05079 and the Deutsche Forschungsgemeinschaft under Grant No. KL 1021/4-1 and the Volkswagen-Stiftung within the program "Complex Materials: Cooperative Projects of the Natural, Engineering, and Biosciences" under the project I/77 737 entitled "Nano-sized ferroelectric Hybrids" is gratefully acknowledged.

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