Vibrations of domain walls in AC field and the low frequency permittivity of ferroelectrics

Abstract

The dielectric permittivity of gadolinium molybdate single crystals was measured in a wide range of the ac field values. Forced vibrations of the ferroelectric domain wall were investigated by the direct optical registration. Such procedure allowed to evaluate directly the contribution of the wall motion into the value of dielectric permittivity. Domain wall induced dispersion of permittivity in low frequency band was observed. A new type of the anomaly of domain wall motion was registered in the vicinity of the transition temperature. The analysis shows that this effect may be a manifestation of the critical behavior of the crystal in the transition region.

Keywords:

• Low-frequency permittivity
• domain wall dynamics
• critical behavior