(Color online) (a) PFM phase, and (b) amplitude images of written domains of P(VDF-TrFE) at 27, 80, 110, and 120 °C obtained using a single frequency; the diameter of the circle is 3 μm, the length of the surrounding square is 6 μm, and the scanning area is 8 × 8 μm2.
(Color online) The variation of average PFM amplitude (left), and phase (right) of written domains in the P(VDF-TrFE) film with respect to temperature.
(Color online) (a) The PFM amplitude image, (b) mappings of the quality factor, (c) mappings of the resonance amplitude corrected by the quality factor, and (d) the resonance frequency of written domains of the P(VDF-TrFE) at 27, 92, 110, and 120 °C; the inner positively polarized square has a length of 6 μm, while the outer negatively polarized square has a length of 15 μm, and the scanning area is 20 × 20 μm2.
(Color online) The variation in (a) measured PFM amplitude, (b) resonance amplitude divided by quality factor. (c) quality factor, and (d) resonance frequency of P(VDF-TrFE) with respect to temperature, all spatially averaged.
(Color online) PFM hysteresis loops of P(VDF-TrFE) at different temperatures.
(a) The variation in the averaged coercive field of positive and negative coercivity, (b) the coercive field asymmetry, (c) averaged maximum amplitudes under positive or negative bias, and (d) the amplitude asymmetry with respect to temperature.
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