title: Diffraction contrast analysis of 90° and 180° ferroelectric domain structures of PbTiO3thin films.
abstract: The ferroelectric domain structure of a PbTiO3thin film on (100) SrTiO3has been investigated by transmission electron microscopy (TEM). Two types of a-domain were found: one extended through the film to the surface and another comprised small a-domains confined within the film. Dark-field TEM (DFTEM) observation revealed that 180° domains formed near the substrate and stopped their growth 100 nm away from the substrate. The DFTEM observation also revealed that 90° domain boundaries had head-to-tail structures. To confirm the polarization direction obtained by experiments, diffracted intensities under a two-beam condition were simulated using the extended Darwin-Howie-Whelan equations. On the basis of the obtained results, a ferroelectric domain structure model of PbTiO3thin films on SrTiO3is proposed.
authors.affiliation: Department of Materials Science, Tohoku University, Sendai, Miyagi 980-8579, Japan.
authors.forename: Kenta
authors.initials: K
authors.lastname: Aoyagi
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan.
authors.forename: Takanori
authors.initials: T
authors.lastname: Kiguchi
authors.affiliation: Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Ehara
authors.affiliation: Department of Materials, Physics and Energy Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan.
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Yamada
authors.affiliation: Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Funakubo
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan.
authors.forename: Toyohiko J
authors.initials: TJ
authors.lastname: Konno
keywords: PbTiO3; TEM; ferroelectric thin film