Role of flexoelectric coupling in polarization rotations at the a-c domain walls in ferroelectric perovskites

Ye Cao, Long Qing Chen, Sergei V. Kalinin

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Ferroelectric and ferroelastic domain walls play important roles in ferroelectric properties. However, their couplings with flexoelectricity have been less understood. In this work, we applied phase-field simulation to investigate the flexoelectric coupling with ferroelectric a/c twin structures in lead ziconate titanate thin films. Local stress gradients were found to exist near twin walls that created both lateral and vertical electric fields through the flexoelectric effect, resulting in polarization inclinations from either horizontal or normal orientation, polarization rotation angles deviated from 90°, and consequently highly asymmetric a/c twin walls. By tuning the flexoelectric strengths in a reasonable range from first-principles calculations, we found that the transverse flexoelectric coefficient has a larger influence on the polarization rotation than longitudinal and shear coefficients. As polar rotations that commonly occur at compositional morphotropic phase boundaries contribute to the piezoelectric enhancement, this work calls for further exploration of alternative strain-engineered polar rotations via flexoelectricity in ferroelectric thin films.

Original languageEnglish (US)
Article number202903
JournalApplied Physics Letters
Volume110
Issue number20
DOIs
StatePublished - May 15 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Role of flexoelectric coupling in polarization rotations at the a-c domain walls in ferroelectric perovskites'. Together they form a unique fingerprint.

Cite this