Abstract

We study the domain structure in ferroelectric thin films with a ‘passive’ layer (material with damaged ferroelectric properties) at the interface between the film and electrodes within a continuous medium approximation. An abrupt transition from a monodomain to a polydomain state has been found with the increase of the ‘passive’ layer thickness d. The domain width changes very quickly at the transition (exponentially with d−2). Similar behavior is obtained for epitaxial ferroelectric (without top electrode) and ferroelastic films. We have estimated the dielectric response dP/dE (the slope of the hysteresis loop) in the ‘fatigued’ multidomain state and found that it is in agreement with experiment, assuming realistic parameters of the layer. We derive a simple universal relation for the dielectric response, which scales as 1/d, involving only the properties of the passive layer. This relation qualitatively reproduces the evolution of the hysteresis loop in fatigued samples and it could be tested with cont...

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