Abstract
Domain switching in ferroelectric thin films with deadlayers subjected to external electric fields is investigated by a phase field model. The simulation results show that the deadlayers of ferroelectric thin films induce a strong inhomogeneous depolarization field which makes polarizations deflect from the normal direction of thin films. The locations with larger depolarization fields are nucleation centers for new domains during the polarization switching and the switching process includes two sequential 90° polarization switchings, which decrease the coercive field significantly. It is found that the thickness of the deadlayer has a significant influence on the switching behavior of the ferroelectric thin films. Both the coercive field and remanent polarization are dependent on the thickness of the deadlayer.
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