Figure 1: Lateral BE-PFM of BFTO/CFO Composite Film.

(a) Topography of sample and schematic of tip and ‘writing in wake’ effect. Two rectangles were then written with the tip biased at −12 V in this region, with the direction of the slow scan axis changed from [100] to [−100]. The results are shown in b Mixed Lateral BE-PFM Image, and the location of the rectangles are indicated with the dashed boundaries. The red arrows indicate the direction of the slow scan axis used during the writing step. Scale bar, 1 μm. (c,d) Selected points from the BE-PFM image, showing the response (filled circles) at individual points as a function of frequency and the corresponding fit (simple harmonic oscillator/SHO, coloured lines), from which the amplitude and phase of the response at that point is determined and combined to produce the mixed BE-PFM image in b. The red, green and magenta points are from the upper switched portion, and the blue, cyan and grey curves are from the lower switched portion. The direction of the polarization vectors in the written rectangles are indicated by the blue arrows. e Amplitude Histogram of poled areas in b.