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Polarization dynamics and non-equilibrium switching processes in ferroelectrics

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Time- and temperature-dependent effects are critical for the operation of non-volatile memories based on ferroelectrics. In this paper, we assume a domain nucleation process of the polarization reversal and we discuss the polarization dynamics in the framework of a non-equilibrium statistical model. This approach yields analytical expressions which can be used to explain a wide range of time- and temperature-dependent effects in ferroelectrics. Domain wall velocity derived in this work is consistent with a domain wall creep behavior in ferroelectrics. In the limiting case of para-electric equilibrium, the model yields the well-known Curie law. We also present experimental P-E loops data obtained for soft ferroelectrics at various temperatures. The experimental coercive fields at various temperatures are well predicted by the coercive field formula derived in our theory.
Original languageEnglish
Pages (from-to)1867-1873
Number of pages7
JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Issue number9
Publication statusPublished - Sep 2011

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