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(Color online) (a) Room temperature hysteresis loops of BPFMO films under various electric fields and (b) Remanent polarization and coercive field as functions of electric field.
(Color online) Polarization fatigue of BPFMO films under various cycling frequencies (a) and cycling fields (b). The inset in (a) illustrates a period of the pulse train.
(Color online) (a) Hysteresis loops of BPFMO capacitors before fatigue, fatigued after 5 × 108 cycles of 222 kV/cm bipolar pulses at 5 kHz (τ1 = 25 μs, τ2 = 100 μs) and rejuvenated by applying 106 cycles of 444 kV/cm bipolar pulses; (b) Frequency dependent dielectric constants of BPFMO capacitors corresponding to the three states in (a).
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