Strain And Symmetry-induced Structural Transitions in Ultra-thin BiFeO3 Films

Strain-induced polarization rotation in epitaxial (001) BiFeO3 thin films.

Direct measurement of the remanent polarization of high quality (001)-oriented epitaxial BiFeO3 thin films shows a strong strain dependence, even larger than conventional (001)-oriented PbTiO3 films. Thermodynamic analysis reveals that a strain-induced polarization rotation mechanism is responsible for the large change in the out-of-plane polarization of (001) BiFeO3 with biaxial strain while t...

Understanding Strain‐Induced Phase Transformations in BiFeO3 Thin Films

Experiments demonstrate that under large epitaxial strain a coexisting striped phase emerges in BiFeO3 thin films, which comprises a tetragonal-like (T') and an intermediate S' polymorph. It exhibits a relatively large piezoelectric response when switching between the coexisting phase and a uniform T' phase. This strain-induced phase transformation is investigated through a synergistic combinat...

Thin Films: Understanding Strain‐Induced Phase Transformations in BiFeO3 Thin Films (Adv. Sci. 8/2015)

Ultrafast photoinduced mechanical strain in epitaxial BiFeO3 thin films

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Structural Instability of Epitaxial (001) BiFeO3 Thin Films under Tensile Strain

We explore BiFeO3 under tensile strain using first-principles calculations. We find that the actual structures are more complex than what had been previously thought, and that there is a strong shear deformation type structural instability which modifies the properties. Specifically, we find that normal tensile strain leads to structural instabilities with a large induced shear deformation in (...