Polarization Switching of the Incommensurate Phases Induced by Flexoelectric Coupling in Ferroelectric Thin Films
The polarization switching of the incommensurate (INC) phases induced by flexocoupling in perovskite ferroelectric thin films is investigated with a multi-field coupling theoretical framework combining the flexoelectric effect. The dominant factors of the formation of INC phases that show antiferroelectric-like double hysteresis loops are examined. The simulations show that mechanical boundary conditions have little influence on the polarization responses of INC phases. The polarization switching behaviors of INC phases are governed by the flexocoupling types described by different flexocoupling coefficients. Only the transverse flexocoupling coefficient related INC phases show antiferroelectric-like double hysteresis loop. The longitudinal flexocoupling coefficient related and shear flexocoupling coefficient related INC phases show imprint-like hysteresis loops and hysteresis loops similar to those of the ferroelectric phase, respectively. The observed different polarization switching behaviors are rationalized by free energy density curves of the INC phases.
L. Jiang et al., "Polarization Switching of the Incommensurate Phases Induced by Flexoelectric Coupling in Ferroelectric Thin Films," Acta Materialia, vol. 90, pp. 344 - 354, Elsevier Ltd, May 2015.
The definitive version is available at https://doi.org/10.1016/j.actamat.2015.02.039
Materials Science and Engineering
Keywords and Phrases
Ferroelectric thin film; Flexoelectric coupling; Incommensurate phase; Phase field method; Polarization switching
International Standard Serial Number (ISSN)
Article - Journal
© 2015 Elsevier Ltd, All rights reserved.
01 May 2015