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a) Corrected PFM amplitude mapping of the BTO:CFO nanocomposite film at a 2 kOe magnetic field. The scale bar in panel (a) is 100 nm. b) Amplitude–voltage butterfly loop of BTO:CFO nanocomposite films before and after the application of an external magnetic field of 2 kOe by using a variable field module. c) Amplitude histogram under different magnetic fields. d) The corrected PFM amplitude under different magnetic fields (0 and ±8 kOe).
