Strain induced internal potentials of compositionally graded epitaxial ferroelectric thin films

2007 
Compositionally graded ferroelectrics produce internal potentials that manifest themselves as asymmetric hysteresis in polarization versus applied field plots. The direction and magnitude of the built-in fields depend on the sense of the chemical gradient in unclamped graded ferroelectrics. A thermodynamic model was employed to understand how these potentials would be affected by an inhomogeneous internal strain in epitaxial compositionally graded ferroelectric structures. The analysis indicates that the strain field can be employed to control both the magnitude and direction of the internal potentials. Indeed, the sense of the polarization gradient may be completely reversed with the appropriate strain gradient.
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    21
    References
    17
    Citations
    NaN
    KQI
    []