%0 Journal Article
%A Petraru, A.
%A Kohlstedt, H.
%A Poppe, U.
%A Waser, R.
%A Solbach, A.
%A Klemradt, U.
%A Schubert, J.
%A Zander, W.
%A Pertsev, N. A.
%T Wedgelike ultrathin epitaxial BaTiO3 films for studies of scaling effects in ferroelectrics
%J Applied physics letters
%V 93
%@ 0003-6951
%C Melville, NY
%I American Institute of Physics
%M PreJuSER-2728
%P 072902
%D 2008
%Z 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.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000259010300053
%R 10.1063/1.2972135
%U https://juser.fz-juelich.de/record/2728