Non-radiative complete surface acoustic wave bandgap for finite-depth holey phononic crystal in lithium niobate Appl. Phys. Lett. 100, 061912 (2012) Investigation of dielectric and electrical properties of Mn doped sodium potassium niobate ceramic system using impedance spectroscopy J. Appl. Phys. 110, 104102 (2011) Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics J. Appl. Phys. 110, 094108 (2011) Finite element method simulation of the domain growth kinetics in single-crystal LiTaO3: Role of surface conductivity J. Appl. Phys. 110, 052016 (2011) Additional information on J. Appl. Phys. Both the ferroelectric and magnetic properties of polycrystalline BiFeO 3 films fabricated by chemical solution deposition were enhanced by adding small amounts of cobalt. Addition of 3 at. % cobalt to BiFeO 3 films increased the remanent polarization from 49 to 72 C / cm 2 and decreased the electric coercive field from 0.54 to 0.44 MV/ cm. The ferroelectricity degraded when the cobalt concentration exceeded 9 at. % due to the formation of the secondary phases of Bi 2 Pt. The saturation magnetization was drastically enhanced by the addition of cobalt up to 12 at. %. This is because the magnetic moments are not canceled locally since the differences of magnetic moment between B-sites. The saturation magnetization decreased when the cobalt content exceeded 15 at. %, thereby attributing to the formation of a nonmagnetic secondary phase of Bi 2 Pt. It is concluded that both ferroelectric and magnetic properties were enhanced, provided only small amount of cobalt were added to the films.

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