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Real-time in situ optical tracking of oxygen vacancy migration in memristors

Di Martino, G; Demetriadou, A; Li, W; Kos, D; Zhu, B; Wang, X; de Nijs, B; ... Baumberg, JJ; + view all (2020) Real-time in situ optical tracking of oxygen vacancy migration in memristors. Nature Electronics , 3 pp. 687-693. 10.1038/s41928-020-00478-5. Green open access

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Abstract

Resistive switches, which are also known as memristors, are low-power, nanosecond-response devices that are used in a range of memory-centric technologies. Driven by an externally applied potential, the switching mechanism of valence change resistive memories involves the migration, accumulation and rearrangement of oxygen vacancies within a dielectric medium, leading to a change in electrical conductivity. The ability to look inside these devices and understand how morphological changes characterize their function has been vital in their development. However, current technologies are often destructive and invasive. Here, we report a non-destructive optical spectroscopy technique that can detect the motion of a few hundred oxygen vacancies with nanometre-scale sensitivity. Resistive switches are arranged in a nanoparticle-on-mirror geometry to exploit the high optical sensitivity to morphological changes occurring in tightly confined plasmonic hotspots within the switching material. Using this approach, we find that nanoscale oxygen bubbles form at the surface of a strontium titanate memristor film, leading ultimately to device breakdown on cycling.

Type: Article
Title: Real-time in situ optical tracking of oxygen vacancy migration in memristors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41928-020-00478-5
Publisher version: https://doi.org/10.1038/s41928-020-00478-5
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Engineering, Electrical & Electronic, Engineering, NANOFILAMENT
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10132342
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