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The role of elastic defects on the kinetics of 180-degree unchargedferroelectric domain wall motion is explored using continuum time-dependent LGDequation with elastic dipole coupling. In one dimensional case, ripples, stepsand oscillations of the domain wall velocity appear due to the wall-defectinteractions. While the defects do not affect the limiting-wall velocity vs.field dependence, they result in the minimal threshold field required toactivate the wall motions. The analytical expressions for the threshold fieldare derived and the latter is shown to be much smaller than the thermodynamiccoercive field. The threshold field is linearly proportional to theconcentration of defects and non-monotonically depends on the average distancebetween them. The obtained results provide the insight into the mesoscopicmechanism of the domain wall pinning by elastic defects in ferroelectrics.

Mesoscopic mechanism of the domain wall interaction with elastic defects in ferroelectrics