Influence of the growth conditions on the nanostructural features of BaTiO3/La0.77Sr0.33MnO3 bilayers

Reference Presenter Authors
08-125 Flavia Regina Estrada Estrada, F.R.(Brazilian Center for Research in Energy and Materials); Muniz, P.S.(Centro Nacional de Pesquisa em Energia e Materiais); Neme, M.D.(Brazilian Center for Research in Energy and Materials); Mori, T.J.(Brazilian Center for Research in Energy and Materials); Cezar, J.C.(Brazilian Center for Research in Energy and Materials); ABO3 perovskites have been attracting much attention due to their relevance on applications involving phenomena such as ferroelectricity, ferromagnetism and metal-insulator transitions. Among the most studied peroviskites are the lead-free ferroelectric compound BaTiO3 (BTO) and the ferromagnetic half metallic La2/3Sr1/3MnO3 (LSMO). When these two materials are combined in epitaxial heterostructures, novel properties can be induced at the ferroelectric/ferromagnetic interface arising from exchanges such as magnetoelectric coupling, for instance. In this work, LSMO/BTO bilayers of various thicknesses were growth by pulsed laser deposition on SrTiO3 (001) single crystal substrates. We studied the impact of growth parameters such as layer thicknesses, growth and post annealing conditions in the structural, surface and interface features of the bilayers. The epitaxy of the layers is confirmed by X-ray diffraction techniques and high resolution transmission electron microscopy (HRTEM) images. The HRTEM images show a high quality LSMO/BTO interface. Although all the samples are epitaxial, atomic force microscopy images reveal a relatively rough surface of the BTO top layer with grains of average size ~20 nm. These grains are confirmed and better analyzed by cross-section HRTEM images. In this sense, we could study the growing mechanism of the BTO layer on the LSMO bottom layer.
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