Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 7: Focus Session: Ferroic Domain Walls I

DF 7.5: Topical Talk

Dienstag, 8. März 2016, 11:30–12:00, H25

Conduction and Diode Behaviour in Charged Domain Walls — •Michael Campbell — Queens University Belfast, Belfast, Northern Ireland, UK

It is now clear that ferroelectric domain walls can have functional properties distinct from bulk. Charged domain walls (or CDWs), at which discontinuities in polarisation occur, have been of particular interest, as they are often associated with strong enhancements in localised conductivity[1-2]. Moveable conducting CDWs could have obvious implications for new forms of *domain wall electronics* and are hence worthy of focused study.

Here we present a multi-faceted investigation into CDWs. We have directly measured dc conduction and used Hall voltage measurements to determine carrier types, densities and mobilities in CDWs in both rare-earth manganites and lithium niobate (LNO). We have probed the properties of naturally forming p-n junctions in domain wall intersection points in ErMnO3 and have directly written CDW p-n junctions using AFM in LNO. 2D diode structures have thus been observed and created within CDWs. We have also seen how direct injection of electrons using Scanning Electron Microscopy can affect the conduction properties of CDWs.

[1]M. Y. Gureev et al. Phys. Rev. B 83, 184104 (2011)

[2]D. Meier et al. Nat. Mat. 11, 284-288 (2012)