Figure 4
From: Atomic-scale mapping of dipole frustration at 90° charged domain walls in ferroelectric PbTiO3 films
Aberration-corrected HAADF imaging of the electric dipoles formed near the 90° NCDW in PbTiO3.
(a) A PbTiO3 film near a SrTiO3 layer shows both charged and uncharged 90° domain-walls. The blue dotted line traces the 90° UCDW, the red dotted line traces the upper 90° NCDW, while the light red dotted line traces the lower 90° NCDW near the STO/PTO interface. The insets are magnifications of the dipoles formed by the displacements of ions in corresponding domains. (b) A PbTiO3 film near a SrTiO3 layer shows 90° UCDW (blue dotted line) near the PTO/STO interface. The insets are magnifications of the dipoles formed by the displacements of ions in corresponding domains. This 90° UCDW is the connection between domain A (in fig. 4a) and a c domain (named as ‘domain C’, as illustrated). Domain C was located at the left side of domain A (fig. 4a). The atomic images in rhombus-highlighted area is used to extract lattice parameters, tetragonality, δTi and Ps.
