Nanoionics-based neuromorphic function of a Pt/Ti_0.96Co_0.04O_{2-/Pt multilayer device operating at low pulse voltage}

We investigated the nanoionics-based neuromorphic function of Pt/Ti0.96Co0.04O2-delta/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-delta 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. (C) 2022 The Japan Society of Applied Physics