TY - JOUR
KW - Transmission electron microscopy
KW - Perovskite
KW - Electrons
KW - Oxygen
KW - Heterostructures
KW - Polarization
KW - Domain walls
KW - Ferroelectric materials
KW - Principal component analysis
KW - Ferroelectricity
KW - Bismuth ferrite
KW - Structural order parameter
KW - Scanning transmission electron microscopy
KW - Bismuth
KW - Ferrite
KW - Scanning
KW - Atomic columns
KW - Charged domain wall
KW - Competing orders
KW - Ferroelectric domain walls
KW - Ginzburg Landau theory
KW - Phase-contrast imaging
KW - Precise analysis
KW - Principal Components
KW - Relative contribution
KW - Shape analysis
KW - Wall energy
KW - Z-contrast scanning
AU - A.Y Borisevich
AU - O.S Ovchinnikov
AU - H.J Chang
AU - M.P Oxley
AU - P Yu
AU - J Seidel
AU - E.A Eliseev
AU - A.N Morozovska
AU - Ramamoorthy Ramesh
AU - S.J Pennycook
AU - S.V Kalinin
AB - Oxygen octahedral tilts underpin the functionality of a large number of perovskite-based materials and heterostructures with competing order parameters. We show how a precise analysis of atomic column shapes in Z-contrast scanning transmission electron microscopy images can reveal polarization and octahedral tilt behavior across uncharged and charged domain walls in BiFeO3. This method is capable of visualizing octahedral tilts to much higher thicknesses than phase contrast imaging. We find that the octahedral tilt transition across a charged domain wall is atomically abrupt, while the associated polarization profile is diffuse (1.5-2 nm). Ginzburg-Landau theory then allows the relative contributions of polarization and the structural order parameters to the wall energy to be determined. © 2010 American Chemical Society.
BT - ACS Nano
DO - 10.1021/nn1011539
LA - eng
M1 - 10
N1 - cited By 111
N2 - Oxygen octahedral tilts underpin the functionality of a large number of perovskite-based materials and heterostructures with competing order parameters. We show how a precise analysis of atomic column shapes in Z-contrast scanning transmission electron microscopy images can reveal polarization and octahedral tilt behavior across uncharged and charged domain walls in BiFeO3. This method is capable of visualizing octahedral tilts to much higher thicknesses than phase contrast imaging. We find that the octahedral tilt transition across a charged domain wall is atomically abrupt, while the associated polarization profile is diffuse (1.5-2 nm). Ginzburg-Landau theory then allows the relative contributions of polarization and the structural order parameters to the wall energy to be determined. © 2010 American Chemical Society.
PY - 2010
SP - 6071
EP - 6079
T2 - ACS Nano
TI - Mapping octahedral tilts and polarization across a domain wall in BiFeO3 from Z-contrast scanning transmission electron microscopy image atomic column shape analysis
VL - 4
SN - 19360851
ER -