Nano-structure around 30° domain wall and elastic interaction with misfit dislocation in PbTiO_3 thin film

摘要

We have elucidated the elastic interaction between the 90° domains and misfit dislocations in PbTiO_3/SrTiO_3 (001) epitaxial thin films by the local strain mapping based on high-resolution transmission electron microscopy. The novel mechanism of the nucleation and growth of 90° domain has been proposed based on the results, including the introduction of the additional dislocation perpendicular to the misfit dislocation and the dissociation of these dislocations into two pairs of partial dislocations with an anti-phase boundary.