Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Microstructure, Real Structure and Crystal Defects

KFM 17.3: Talk

Friday, March 20, 2020, 10:10–10:30, TOE 317

Using atomic force microscopy to tune functionality at the nanoscale — •Donald M. Evans¹, Theodor S. Holstad¹, Aleksander B. Mosberg¹, Didrik R. Småbråten¹, Per E. Vullum², Anup L. Dadlani¹, Zewu Yan^3,4, Edith Bourret-Courchesne⁴, Jan Torgersen¹, Antonius T. J. van Helvoort¹, Sverre M. Selbach¹, and Dennis Meier¹ — ¹NTNU, Trondheim, Norway — ²SINTEF Industry, Trondheim, Norway — ³ETH Zurich, Zürich, Switzerland — ⁴Lawrence Berkeley National Laboratory, Berkeley, USA

The control of conductivity is critical to any electronic device. In this context, oxide materials are particularly interesting as their conductivity can be continuously tuned via an electric field. In addition, they have a plethora of inherent functionalities arising from the electronic degrees of freedom, such as, superconductivity, magnetism, and ferroelectricity. However, utilizing both these changes in conductivity and electronic degrees of freedom simultaneously requires the ability to change one without affecting the other. Usually this is a problem, as the net redox reaction that gives the change in conductivity also affects the electronic degrees of freedom. In this talk, I demonstrate how stable, nanoscale, enhancement of conductivity can be achieved in ferroelectrics without net mass transfer, net change in stoichiometry, or the build-up of spurious electric and chemical gradients. This approach permits both the multiple orders of magnitude change in conductivity and the inherent functionality of oxides to be utilized independently and in parallel to each other.