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Epitaxial growth and characterization of oxide thin films

More than ten kinds of oxide thin films and their heterostructure have been successfully fabricated on SrTiO3 (001) substrates by laser molecular beam epitaxy. Measurements of atomic force microscopy, high-resolution transmission electron microscope and x-ray small-angle reflectivity reveal that the surfaces and interfaces are atom-level-smooth. The unit cell layers and the lattice structure are perfect. The enhancement of second-harmonic generation in BaTiO3/SrTiO3 (BTO/STO) superlattices and the thickness dependent structural characteristics of BaTiO3 (BTO) thin films were observed.