Nanoionics-based neuromorphic function of a Pt/Ti0.96Co0.04O2-δ /Pt multilayer device operating at low pulse voltage

Abstract

Abstract We investigated the nanoionics-based neuromorphic function of Pt/Ti0.96Co0.04O2−δ /Pt multilayers with a cross-point structure prepared by RF magnetron sputtering. This multilayer exhibits electro-ion mixed conduction and a nonlinear current–voltage characteristic based on the Schottky barrier between Pt and Ti0.96Co0.04O2−δ layers. When the low electrical pulse of 0.8 V was applied with a short interval time of 14 s, current modulation corresponding to the long-term memorization (LTM) was observed, though the current response at the long interval time of 80 s was the short-term memorization (STM). The O 1 s photoemission spectrum showed the OH− peak that contributes to the electron-ion mixed conduction. The current responses with both LTM and STM are considered to be due to the local proton migration at near the Schottky barrier.