Ferroelectric and Piezoelectric Properties of Polycrystalline BiFeO3 Thin Films Prepared by Pulsed Laser Deposition under Magnetic Field
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概要
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Polycrystalline BiFeO3 (BFO) thin films have been prepared on Pt/TiO2/SiO2/Si substrates by using a pulsed laser deposition (PLD) method under a magnetic field. The X-ray diffraction (XRD) pattern shows a single-phase perovskite structure with no secondary phases, and (010) and (020) peaks slightly shift to lower angles in comparison with those of a BFO thin film prepared without a magnetic field. A columnar structure and small grain size were observed and the leakage current is slightly high in comparison with that of a BFO thin film prepared without a magnetic field. A polarization versus electric field (P--E) hysteresis loop was obtained at RT and the polarization at zero electric field is 50 μC/cm2. Ferroelectric domain switching corresponding to up and down polarization states was confirmed. An enhanced piezoelectric coefficient (d_{33}) of about 100 pm/V has been obtained at a certain point. Ferroelectric and piezoelectric properties were affected by a columnar microstructure formed by magnetic field application.
- 2012-09-25
著者
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Park Jung
Graduate School Of Mechanical Design And Engineering Pusan National Engineering
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Sohgawa Masayuki
Graduate School Of Engineering Science Osaka University
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Kanashima Takeshi
Graduate School Of Engineering Science Osaka University
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Okuyama Masanori
Institute for NanoScience Design, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Nakashima Seiji
Graduate School of Engineering, University of Hyogo, Himeji, Hyogo 671-2201, Japan
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Park Jung
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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