Abstract
BaTiO3 (BTO) thin films were epitaxially deposited on LaAlO3(LAO) substrates with epitaxial La0.5Sr0.5MnO3(LSMO) electrodes by pulsed laser deposition. We confirmed that the epitaxial BTO thin films on LSMO/LAO substrates remarkably showed the increased remnant polarization in comparison with the epitaxial BTO thin films on Pt/MgO substrates. It was inferred that the enhanced ferroelectric polarization in the epitaxial BTO thin films on LSMO/LAO substrates arose from the increased tetragonality with the c/a ratio of 1.04. Piezoresponse force microscopy study revealed that the epitaxial BTO thin film on LSMO/LAO substrate possessed higher domain wall energy than that of the PbTiO3 thin films, which implies fine domain structure of the epitaxial BTO thin films on LSMO/LAO substrates.
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