Electrochemical ferroelectric switching: The origin of polarization reversal in ultrathin films

Details Electrochemical ferroelectric switching: The origin of polarization reversal in ultrathin films Electrochemical ferroelectric switching: The origin of polarization reversal in ultrathin films

2011-08-10

arxiv.org/abs/1108.2208v2

Phys. Rev. B 85, 024106 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Updated, 7 pages

Scientific paper

10.1103/PhysRevB.85.024106

Against expectations, robust switchable ferroelectricity has been recently observed in ultrathin (1 nm) ferroelectric films exposed to air [V. Garcia $et$ $al.$, Nature {\bf 460}, 81 (2009)]. Based on first-principles calculations, we show that the system does not polarize unless charged defects or adsorbates form at the surface. We propose electrochemical processes as the most likely origin of this charge. The ferroelectric polarization of the film adapts to the bound charge generated on its surface by redox processes when poling the film. This, in turn, alters the band alignment at the bottom electrode interface, explaining the observed tunneling electroresistance. Our conclusions are supported by energetics calculated for varied electrochemical scenarios.

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