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Domain wall dynamics in ferroic materials underpins functionality of datastorage and information technology devices. Using localized electric field of ascanning probe microscopy tip, we experimentally demonstrate a surprisinglyrich range of polarization reversal behaviors in the vicinity of the initiallyflat 180\deg ferroelectric domain wall. The nucleation bias is found toincrease by an order of magnitude from a 2D nucleus at the wall to 3D nucleusin the bulk. The wall is thus significantly ferroelectrically softer than thebulk. The wall profoundly affects switching on length scales of the order ofmicrometers. The mechanism of correlated switching is analyzed using analyticaltheory and phase-field modeling. The long-range effect is ascribed to wallbending under the influence of a tip bias well below the bulk nucleation fieldand placed many micrometers away from the wall. These studies provide anexperimental link between the macroscopic and mesoscopic physics of domainwalls and atomistic models of nucleation.

Local Probing of Mesoscopic Physics of Ferroelectric Domain Walls