Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 7: Focus Session: Ferroic Domain Walls I

DF 7.7: Vortrag

Dienstag, 8. März 2016, 12:20–12:40, H25

Methods to create electronically compensated charged domain walls in ferroelectrics without scanning probe techniques — •Tomas Sluka¹, Arnaud Crassous¹, Petr Bednyakov¹, Igor Stolichnov¹, Ludwig Feigl^1,2, Dragan Damjanovic¹, Alexander Tagantsev¹, and Nava Setter¹ — ¹EPFL - Swiss Federal Institute of Technology, Lausanne, Switzerland — ²Karlsruhe Instute of Technology, Karlsruhe, Germany

Charged Domain Walls (CDWs) in ferroelectrics were predicted to be metallicaly conducting interfaces that can be positioned inside a monolith of nominally insulating materials. Such CDWs are thus promising elements for the envisaged reconfigurable nanoelectronics. Indeed, highly elevated conductivity was observed at CDWs in several ferroelectric materials. The progress towards CDW exploitation is however hindered by the absence of practical CDW engineering techniques. CDWs were found either locked in as grown patterns, were created locally with scanning probe techniques or stochastically with defect assisted compensation. Here we introduce a set of methods which allow to create electronically compensated CDWs without the need of a scanning probe tip or presence of charged defects. The methods range from the use of superbandgap illumination which generates free carries that compensate appearing CDWs to the use of inhomogeneous electric fields and electron injection inside nanoscale structures. It will be shown that CDWs can be reliably produced in forms of large regular patters or few-nanometes long precisely positioned channels. These methods open the doors to the advanced investigation of CDWs.