Electrochemical ferroelectric switching

Bristowe, N. C. and Stengel, Massimiliano and Littlewood, P. B and Pruneda, J. M and Artacho, Emilio (2012) Electrochemical ferroelectric switching. Physical Review B (Condensed Matter and Materials Physics), 85 (2).

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Official URL: http://link.aps.org/doi/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.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Volume: 85
Depositing User: Sarah Humbert
Date Deposited: 07 Oct 2011 17:17
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2190

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