11-05 :: May/June 2011

nanotimes News in Brief

53

The evidence for polarization dependent conduction in BFO thin films. After time integrations of the displacement cur- rents under different V, P-V hysteresis loops in (a) obtained for BFO thin films in comparison with their hysteretic current loops in (b) at fixed reading voltages of 4.0 V, after each pulse voltage in P-V loops. (c) Piezoelectric phase image of original preferred polarization patterns (downward) switched upward through PFM tip scanning of the film surface at -8 V within a square area of 3 × 3µm2

. After that, the polarization in the center 1 × 1µm2 area is scanned downward at + 8

V. (d) The current mapping at acquired in the same region as in (c). © Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, China