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Physics Seminar

Squeezing light inside memory devices for improved performances

Speaker: Dr Giuliana Di Martino (University of Cambridge)
Date: Wednesday 30 September 2020
Time: 15:00
Venue: Zoom

I will discuss how, simply with the aid of visible light, we see morphological changes happening inside functioning memory devices allowing their breakdown mechanisms to be probed. I will focus on a specific class of devices, known as memristors, which are low-power, nanosecond response devices that are used in a range of memory-centric technologies. The ability to understand how morphological changes characterise their function is vital in their development, but looking deep inside a 3D nanoscale active device has proved extremely tough with traditional investigation techniques. To solve this, we have discovered how to reliably construct nm-sized cavities and routinely confine light within these active devices. We are now able to detect the motion of just few oxygen vacancies and therefore identify the breaking mechanisms upon cycling. This opens up new routes for device optimization and enables large-scale technology applications.

[1] Di Martino et al.; Nature Electronics, just accepted (2020); Real-Time In-Situ Optical Tracking of Oxygen Vacancy Migration in Memristors [2] Di Martino et al.; Nanophotonics (2019); 8, 1579; Optically Accesible Memristive Devices [3] Di Martino et al.; Small (2016) 12, 1334; Nanoscale Plasmon-enhanced spectroscopy in Memristive Switches