Ferroelectric properties of multiphase Bi–Fe–O thin films

We report on the ferroelectric properties of multiphase BiFeO 3 thin films grown under varying oxygen deposition pressures. The dominant phases formed in the film change continuously from a mixture of BiFeO 3 and Bi 2O 3 to a mixture of BiFeO 3 and Fe 2O 3 as the pressure is varied. X-ray diffractio...

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Bibliographic Details
Published in:Solid state ionics 2007-07, Vol.178 (21), p.1257-1261
Main Authors: Fujino, S., Murakami, M., Lim, S.-H., Wuttig, M., Salamanca-Riba, L.G., Takeuchi, I.
Format: Article
Language:English
Subjects:
BiFeO 3
Fe 2O 3
Ferroelectric
Leakage current
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Summary:We report on the ferroelectric properties of multiphase BiFeO 3 thin films grown under varying oxygen deposition pressures. The dominant phases formed in the film change continuously from a mixture of BiFeO 3 and Bi 2O 3 to a mixture of BiFeO 3 and Fe 2O 3 as the pressure is varied. X-ray diffraction and transmission electron microscopy revealed that an epitaxial nanocomposite of BiFeO 3 and Fe 2O 3 grew at deposition pressures of approximately 20 mTorr. The BiFeO 3 grains in the BiFeO 3–Fe 2O 3 nanocomposites were completely relaxed and unstrained. At room temperature the BiFeO 3–Fe 2O 3 nanocomposite film was characterized by a high switchable polarization (60 μC/cm 2) and a low leakage current density (≈ 1 × 10 − 4  A/cm 2 at 250 kV/cm).
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2007.07.004