@article{31fd275d949045d0a688a67659b229ff,
title = "Growth mechanism and domain structure study on epitaxial BiFeO3film grown on (La0.3Sr0.7)(Al0.65Ta0.35)O3",
abstract = "A BiFeO3 (BFO) film is epitaxially grown on an (La0.3Sr0.7)(Al0.65Ta0.35)O3 (LSAT) substrate to investigate the lattice mismatch effect on the domain structure and lattice strain status within the BFO film. Atomic resolution scanning transmission electron microscope image, selected area electron diffraction (SAED) patterns, and X-ray reciprocal space mapping (XRSM) data clearly reveal that the lattice strain originating from the lattice mismatch between BFO and LSAT is relaxed by causing misfit dislocations in the BFO film. The SAED and XRSM data indicate that the crystal structure of BFO film is rhombohedral with the space group R3c. In particular, XRSM data acquired along two different in-plane orientations reveal that the BFO layer consists of two different domains that were 90° off each other with respect to the surface normal orientation. An atomistic model based on the crystal orientation relation found by SAED and XRSM shows that (1) the ferroelectric polarization axes of both domains are 35.6° with respect to the BFO film surface and (2) the two domains are consistent with the so-called 71° (and/or 109°) ferroelectric domains reported previously. The lattice mismatch of ∼2.8% calculated based on the epitaxial relation is proposed to be too large to be stored as elastic strain energy within the BFO layer.",
author = "Bae, {In Tae} and Shintaro Yasui and Tomohiro Ichinose and Mitsuru Itoh and Takahisa Shiraishi and Takanori Kiguchi and Hiroshi Naganuma",
note = "Funding Information: This research was partially funded by the Small Scale Systems Integration and Packaging Center (S3IP) at the State University of New York at Binghamton. S3IP is a New York State Center of Excellence and receives funding from the New York State Office of Science, Technology and Innovation (NYSTAR), the Empire State Development Corporation, and a consortium of industrial members, and by the MEXT Elements Strategy Initiative to Form Core Research Center. The STEM study was supported by the Tohoku University Nanotechnology Platform Project (No. A-18-TU-0013), sponsored by MEXT, and the Collaborative Research Project of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Japan. N.H. is grateful for the financial support by Grant-in-Aid for Scientific Research (Category B) (No. 15H03548), JSPS core to core program A, Advanced Research Networks, the Collaborative Research Project of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology (category B), Center for Spintronics Integrated System, and Murata foundation. S.Y. also thanks JSPS Grant-in-Aid for Scientific Research (B) (No. 19H02426) and Challenging Research (Exploratory) (No. 18K19126). Publisher Copyright: {\textcopyright} 2020 Author(s).",
year = "2020",
month = jun,
day = "28",
doi = "10.1063/5.0005672",
language = "English",
volume = "127",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "24",
}