Abstract
The Rayleigh law and a propagating switching region of a ferroelectric polycrystal are studied with a finite element model. Each crystallite, represented by a cubic element in a finite element mesh, is a single domain that switches completely without a simulated domain wall motion. The model involves only electric field induced (i.e., ferroelectric) switching. Under a low applied field, the model reproduces the Rayleigh law. The model predicts that a switching crystallite and its follow-up switching crystallite are likely to be the nearest neighbors and that the switching sequence of the crystallites forms the shape of an ellipsoid the major axis of which is parallel with the applied field direction. A spontaneous polarization reverses by direct 180° reorientation if only one layer of the finite elements between two electrodes is simulated but reverses by two consecutive 90° domain reorientations if the number of stacked layers between the electrodes is equal to two or greater.
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