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(color online). Ferroelectric switching of inner aortic wall by PFM; (a) schematics of switching PFM; (b) phase-voltage hysteresis loop and (c) amplitude-voltage butterfly loop measured at three different points; SSPFM mapping of (d) remnant PFM amplitude, (e) coercive voltage, and (f) nucleation bias in a 2 × 2 μm2 area.
