title: Defect control for polarization switching in BiFeO₃ single crystals.
abstract: BiFeO₃ (BFO) single crystals were grown and the effects of Zn and Mn co-doping on the polarization and leakage current properties were investigated at 25 °C for establishing materials design based on defect chemistry. Although Zn doping or Mn doping led to a deterioration in the properties, Zn-Mn co-doping led to a large remanent polarization (36 μC/ cm²), a low coercive field (19 kV/cm), and a relatively low leakage current density (~10⁻⁸ A/cm²). It is proposed that defect dipoles composed of Zn²+ and Mn⁴+ act as effective nucleation sites for ferroelectric domains during polarization switching in BFO crystals.
authors.affiliation: Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Chishima
authors.forename: Yuji
authors.initials: Y
authors.lastname: Noguchi
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Kitanaka
authors.forename: Masaru
authors.initials: M
authors.lastname: Miyayama