Composition dependence in BiFeO3 film capacitor with suppressed leakage current by Nd and Mn cosubstitution and their ferroelectric properties
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概要
- 論文の詳細を見る
(Nd,Mn)-cosubstituted BiFeO3 (BFO) films with various Nd and Mn compositions were fabricated on a Pt/SrTiO3(100) substrate by pulsed laser deposition. X-ray diffraction patterns and atomic force microscopy images indicated that the suppression of impurity phases and a smooth surface morphology were realized by Nd substitution in the BFO films. Furthermore, by combining with Nd substitution, a small amount of Mn substitution in BFO films is effective for reducing the leakage current density by three orders of magnitude compared with that of a BFO film capacitor. The polarization vs electric field (P-E) curves showed a strong dependence of measurement frequency in the range of 0.1-2 kHz, and well-saturated P-E hysteresis loops were observed at 20kHz at room temperature. The remanent polarization and coercive field at a maximum electric field of 1.9MV/cm were approximately 70μC/cm2 and 0.32MV/cm, respectively. © 2008 The Japan Society of Applied Physics.
- 2008-09-25
著者
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Okamura Soichiro
Department Of Applied Physics Faculty Of Science Science University Of Tokyo
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Kawae Takeshi
Graduate School Of Natural Science And Technology Kanazawa University
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Morimoto Akiharu
Graduate School Of Natural Science And Technology Kanazawa University
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Tsuda Hisashi
Graduate School Of Natural Science And Technology Kanazawa University
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Naganuma Hiroshi
Department Of Applied Physics Faculty Of Science Tokyo University Of Science
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Kumeda Minoru
Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
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Okamura Soichiro
Department of Applied Physics, Faculty of Science, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan
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Yamada Satoru
Ishikawa National College of Technology, Tsubata, Ishikawa 920-0392, Japan
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Kumeda Minoru
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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