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Barkhausen current noise is used to probe the slow field-driven conversion ofthe glassy relaxor ferroelectric state to an ordered ferroelectric (FE) state.The frequent presence of distinct micron-scale Barkhausen events well beforethe polarization current starts to speed up shows that the process is not aconventional nucleation-limited one. The prevalence of reverse switching eventsnear the onset of the rapid part of the transition strongly indicates thatelectric dipole interactions play a key role. The combination of Barkhausennoise changes and changes in the complex dielectric response indicate that theprocess consists of an initial mixed-alignment domain formation stage followedby growth of the domains aligned with the applied field.

Barkhausen Noise Probe of the Ferroelectric Transition in the Relaxor PbMg1/3Nb2/3O3-12% PbTiO3