Publication Type:Journal Article
Source:Applied Physics Letters, Volume 97, Number 11 (2010)
Keywords:bismuth, Bismuth ferrites, epitaxial strain, ferrite, harmonic generation, Lead-free ferroelectrics, Monoclinic distortion, Monoclinic phasis, Morphotropic phase boundaries, Nonlinear optics, Optical films, Optical second harmonic generation, Relative ratios, Rhombohedral unit cells, Tetragonal and rhombohedral phasis, Theoretical study
Epitaxial strain can induce the formation of morphotropic phase boundary in lead free ferroelectrics like bismuth ferrite, thereby enabling the coexistence of tetragonal and rhombohedral phases in the same film. The relative ratio of these phases is governed by the film thickness and theoretical studies suggest that there exists a monoclinic distortion of both the tetragonal as well as the rhombohedral unit cells due to imposed epitaxial strain. In this work we show that optical second harmonic generation can distinguish the tetragonal-like phase from the rhombohedral-like phase and enable detection of monoclinic distortion in only a pure tetragonal-like phase. © 2010 American Institute of Physics.
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