Crystal Structures and Electrical Properties of Epitaxial BiFeO3 Thin Films with (001), (110), and (111) Orientations

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概要

• 論文の詳細を見る

• BiFeO3 (BFO) films were formed on (001), (110), and (111) La-doped SrTiO3 single-crystal substrates. All the films were epitaxially grown and had mainly rhombohedral structure. The BFO film formed on the (001) substrate had only a (001) component whereas the BFO films on (110) and (111) substrates had ($\bar{1}10$) and ($\bar{1}11$) components, respectively. The (001), (110), and (111) epitaxial BFO films showed the remanent polarizations of 63, 84, and 106 μC/cm2, respectively. It seems that the ($\bar{1}10$) and ($\bar{1}11$) components were changed to (110) and (111) ones, respectively, by applying an external voltage. The (001) epitaxial BFO film showed marked asymmetry in its electrical properties. It was found that the (001) epitaxial BFO film had a thin tetragonal layer with spontaneous polarization fixed in the downward direction near the substrate. Finally, we concluded that this tetragonal layer caused the accumulation of space charges at the interface, causing a downward built-in field to be generated. The downward build-in field facilitated the switching of upward polarization and caused asymmetric relaxation.

• 2010-09-25

著者

• Okamura Soichiro

  Tokyo Univ. Sci. Tokyo Jpn

• NAGANUMA Hiroshi

  Tohoku Electric Power Engineering & Construction, Co., Ltd.

• Nakajima Takashi

  Tokyo Pharmaceutical Research Laboratories Nissin Food Products Co. Ltd.

• Nakajima Takashi

  Tokyo University of Science, Department of Applied Physics, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan

• Sone Keita

  Tokyo University of Science, Department of Applied Physics, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan

• Miyazaki Takamichi

  Tohoku University, Department of Instrumental Analysis, 6-6-11 Aoba, Aramaki, Aoba, Sendai 980-8579, Japan

• Okamura Soichiro

  Tokyo University of Science, Department of Applied Physics, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan

• Naganuma Hiroshi

  Tohoku University, Department of Applied Physics, 6-6-05 Aoba, Aramaki, Aoba, Sendai 980-8579, Japan

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