Mössbauer spectra and electric properties of 57 Fe-enriched BiFeO 3 thin films

Kiyotaka Tanaka, Yuya Fujita, Soichiro Okamura, Yutaka Yoshida

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57 Fe-enriched BiFeO 3 (BFO) thin films are fabricated on Pt/Ti/SiO 2 /Si substrates from a stoichiometric precursor solution by chemical solution deposition process. The microstructure of the thin films is controlled by a changing the sintering time at 550 °C. The polycrystalline thin film fabricated at 550 °C for 5 min shows well-saturated polarization-electric field (P-E) hysteresis loops and the remnant polarization Pr and coercive field E c at room temperature are 52 μC/cm 2 and 365 kV/cm, respectively, at an applied electric field of 1200 kV/cm. The Mössbauer spectra show that the BFO thin film has the valence state of Fe 3+ only, consisting of antiferromagnetic and paramagnetic components. The paramagnetic component with an area fraction from 11 to 18%, which is not amorphous or Bi 2 Fe 4 O 9 , seems to distribute in the surface shell of the grains and the grain boundaries. This component must strongly influence the ferroelectric properties at room temperature.

Original languageEnglish
Article number09PA15
JournalJapanese Journal of Applied Physics
Issue number9
Publication statusPublished - 1 Oct 2014

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