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Schematic configurations of (a) the multilayer graded sample and (b) the homogenous BST film.
(a) AFM topography and PFM amplitude images taken at 2, 6, and . for the homogenous BST film. (b) The same image types and conditions obtained for the multilayer graded sample.
Calculated average piezoresponse of PFM images obtained at each voltage step vs ac voltage for the multilayer and homogeneous samples. 95% confidence error bars are less than 3% and too negligible to be visible on the graph.
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