Insights into nanoscale electrochemical reduction in a memristive oxide : The role of three-phase boundaries
| Autor: | Regina Dittmann, Annemarie Köhl, Rainer Waser, Marten Patt, Claus M. Schneider, Christian Lenser, Stephan Menzel, C. Wiemann |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
X-ray absorption spectroscopy
Materials science genetic structures Oxide Nanotechnology Physik (inkl. Astronomie) Condensed Matter Physics Electrochemistry Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Photoemission electron microscopy chemistry Electrode sense organs Triple phase boundary Joule heating Nanoscopic scale |
| Popis: | The nanoscale electro-reduction in a memristive oxide is a highly relevant field for future non-volatile memory materials. Photoemission electron microscopy is used to identify the conducting filaments and correlate them to structural features of the top electrode that indicate a critical role of the three phase boundary (electrode-oxide-ambient) for the electro-chemical reduction. Based on simulated temperature profiles, the essential role of Joule heating through localized currents for electro-reduction and morphology changes is demonstrated. The three-phase boundary between electrode, oxide and ambient is shown to play a crucial role for the electroreduction in resistively switchable devices fabricated from Fe-doped SrTiO3. Nanoscale chemical mapping by X-ray photoemission electron microscopy, combined with simulated temperature profiles of the filaments, provide evidence that localized Joule heating at the electrode edge is essential for the formation of conducting filaments. \copyright 2014 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim. |
| Databáze: | OpenAIRE |
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