Effects of unequally biaxial misfit strains on polarization phase diagrams in embedded ferroelectric thin layers: Phase field simulations

Liu, Ping-Li; Wang, Jie; Zhang, Tong-Yi; Li, Yulan; Chen, Long-Qing; Ma, Xing-Qiao; Chu, Wu-Yang; Qiao, Li-Jie
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p132908
Academic Journal
Phase field simulations were conducted to investigate the effects of unequally biaxial misfit strains on domain stability diagrams and equilibrium domain structures in an epitaxial ferroelectric PbTiO3 thin layer, which is sandwiched in a nonferroelectric medium. The simulations reveal a multidomain structure in the layer and allow constructing “misfit strain-misfit strain” and “temperature-misfit strain” phase diagrams. It is found that unequally biaxial misfit strains may lead to the presence of a single tetragonal variant, either a-domains or b-domains, which do not exist if the misfit strains are equally biaxial.


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