Vertical drift of P–E hysteresis loop in asymmetric ferroelectric capacitors

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Abstract
One kind of distortion in P–Ehysteresis of ferroelectric thin‐film capacitors, namely vertical drift of P–Ehysteresis loop, is discussed. This kind of distortion, usually observed in asymmetric ferroelectric thin‐film capacitors, originates from the asymmetric conduction of the capacitor at different polarities. The shapes of the distorted hysteresis loops are studied by applying a simple circuit model with respect to the measuring frequency, applied voltage amplitude, and different leakage conductance, etc. and are verified with experiment.