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Direct Observation of Atomic Arrangement around 90° Domain Wall in Lead Titanate Thin Films.

Published online by Cambridge University Press:  08 October 2013

Takanori Kiguchi ,
Toyohiko J. Konno ,
Yoshitaka Ehara ,
Tomoaki Yamada  and
Hiroshi Funakubo
Takanori Kiguchi
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Toyohiko J. Konno
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Yoshitaka Ehara
Affiliation:
Department of Innovative and Engineered Materials, Interdisciplinary Graduated School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan
Tomoaki Yamada
Affiliation:
Department of Materials, Physics and Energy Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan PRESTO, Japan Science and Technology Agency, 5 Sanban-cho, Chiyoda-ku, Tokyo 102-0075, Japan
Hiroshi Funakubo
Affiliation:
Department of Innovative and Engineered Materials, Interdisciplinary Graduated School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan
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Abstract

The growth mechanism of large-size domains in PbTiO3/SrTiO3 heteroepitaxial thin films was examined using annular bright field (ABF) – scanning transmission electron microscopy and geometric phase analysis (GPA). {101} domain walls surrounded 90° domains. The large 90° domain grows by the coalescence of the nano-size domains of less than 5 nm width. A strain map obtained from the GPA of ABF-STEM image showed that 90° domains interacted elastically and attractively with edge dislocations at PbTiO3/SrTiO3 interface through simple shear strain.

Keywords

ferroelectricscanning transmission electron microscopy (STEM)epitaxy

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