Flexopiezoelectricity at ferroelastic domain walls in WO₃ films.

ABSTRACT: The emergence of a domain wall property that is forbidden by symmetry in bulk can offer unforeseen opportunities for nanoscale low-dimensional functionalities in ferroic materials. Here, we report that the piezoelectric response is greatly enhanced in the ferroelastic domain walls of centrosymmetric tungsten trioxide thin films due to a large strain gradient of 10⁶ m^-1, which exists over a rather wide width (~20 nm) of the wall. The interrelationship between the strain gradient, electric polarity, and the electromechanical property is scrutinized by detecting of the lattice distortion using atomic scale strain analysis, and also by detecting the depolarized electric field using differential phase contrast technique. We further demonstrate that the domain walls can be

SUBMITTER: Yun S 

PROVIDER: S-EPMC7524836 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature