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In this paper, we consider the shape instability of ferroelectric wavy domain wall that moves uniformly in the ferroelectric capacitor under the constant uniform electric field. The retardation of the bulk screening of residual depolarization field and existing of the surface dielectric layers were taken into account. It was shown that the spatial distribution of the electric field in the ferroelectric plate led to topological instability of the moving wavy domain wall. The obtained results are important for the formation of the self-assembled domain structures in ferroelectrics. [ABSTRACT FROM AUTHOR]

In this paper, we established the origin of the experimentally observed topological instability representing the change of the plane domain wall shape by formation of so-called “fingers” during fast polarization reversal of the ferroelectric capacitor. By means of a simplified model we show that the topological instability of the domain wall can be attributed to retardation of the bulk screening of residual depolarization field. [ABSTRACT FROM PUBLISHER]