Abstract
The polarization reversal process has been studied in 1 mol. % MgO doped stoichiometric lithium tantalate (LT) single crystal. The revealed stages of domain structure evolution represent (1) continuous nucleation and growth of isolated hexagonal domains with walls oriented along Y directions and (2) continuous motion of the plane domain walls stimulated by merging with isolated domains. The activation field dependence of the switching time has been revealed. The coercive field for quasi-static switching is about 150 V/mm. The bulk screening process has been analyzed. The main parameters of the switching process have been compared with other representatives of LT family.
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