Electrically-driven control of nanoscale chemical changes in amorphous complex oxide memristive devices.

In this paper we investigate the electrical response response of amorphous complex oxide memristors under different electrical stimulation. With the help of transmission electron microscopy and energy dispersive x-ray spectroscopy, we observed that those devices stimulated with voltage display strong cationic segregation at the nanoscale together with the partial crystallization of the oxide layer. On the other hand, devices stimulated with current maintain their amorphous character with no significative chemical changes.

Oxygen vacancy dynamics in Pt/TiO/TaO/Pt memristors: exchange with the environment and internal electromigration.

Memristors are expected to be one of the key building blocks for the development of new bio-inspired nanoelectronics. Memristive effects in transition metal oxides are usually linked to the electromigration at the nanoscale of charged oxygen vacancies (OV). In this paper we address, for Pt/TiO/TaO/Pt devices, the exchange of OV between the device and the environment upon the application of electrical stress.