Phatak, C.4; Petford-Long, A. K.4; Beleggia, Marco1; De Graef, M.3
1 Center for Electron Nanoscopy, Technical University of Denmark2 Argonne National Laboratory3 Carnegie Mellon University4 Argonne National Laboratory
Ferroelectric nanostructures are important for a variety of applications in electronic and electro-optical devices, including nonvolatile memories and thin-film capacitors. These applications involve stability and switching of polarization using external stimuli, such as electric fields. We present a theoretical model describing how the shape of a nanoparticle affects its polarization in the absence of screening charges, and quantify the electron-optical phase shift for detecting ferroelectric signals with phase-sensitive techniques in a transmission electron microscope. We provide an example phase shift computation for a uniformly polarized prolate ellipsoid with varying aspect ratio in the absence of screening charges.
Physical Review B (condensed Matter and Materials Physics), 2014, Vol 89, Issue 21