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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Ferroelectric Field Effect Induced Asymmetric Resistive Switching Effect in BaTiO3/Nb:SrTiO3 Epitaxial Heterojunctions

Fig. 2

a Surface morphology of the BTO films on NSTO substrates. b Local PFM out-of-plane hysteresis loops: blue, phase signal; black, amplitude signal. c PFM out-of-plane phase, d PFM out-of-plane amplitude, e current, and f SKPM images recorded over the same area (a) after writing an area of 2 × 2 μm2 with − 8 V and then the central 1.25 × 1.25 μm2 square with + 8 V using a biased conductive tip. The scale bar is 500 nm for the images of a and cf. The labels in ce are corresponding to the value of out-of-plane current, PFM phase, and PFM amplitude, respectively

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