Injection and controlled motion of conducting domain walls in improper ferroelectric Cu-Cl boracite

Raymond G.P. McQuaid, Michael P. Campbell, Roger W. Whatmore, Amit Kumar and J. Marty Gregg ()
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Raymond G.P. McQuaid: Centre for Nanostructured Media, School of Mathematics and Physics, Queen’s University Belfast
Michael P. Campbell: Centre for Nanostructured Media, School of Mathematics and Physics, Queen’s University Belfast
Roger W. Whatmore: Imperial College London
Amit Kumar: Centre for Nanostructured Media, School of Mathematics and Physics, Queen’s University Belfast
J. Marty Gregg: Centre for Nanostructured Media, School of Mathematics and Physics, Queen’s University Belfast

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Ferroelectric domain walls constitute a completely new class of sheet-like functional material. Moreover, since domain walls are generally writable, erasable and mobile, they could be useful in functionally agile devices: for example, creating and moving conducting walls could make or break electrical connections in new forms of reconfigurable nanocircuitry. However, significant challenges exist: site-specific injection and annihilation of planar walls, which show robust conductivity, has not been easy to achieve. Here, we report the observation, mechanical writing and controlled movement of charged conducting domain walls in the improper-ferroelectric Cu3B7O13Cl. Walls are straight, tens of microns long and exist as a consequence of elastic compatibility conditions between specific domain pairs. We show that site-specific injection of conducting walls of up to hundreds of microns in length can be achieved through locally applied point-stress and, once created, that they can be moved and repositioned using applied electric fields.

Date: 2017
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DOI: 10.1038/ncomms15105

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