Voltage-dependent resistive switching characteristics in mixed layer consisting of gamma-Fe2O3 and Pt-Fe2O3 core-shell nanoparticles

Abstract

A mixed layer of gamma-Fe2O3 and Pt-Fe2O3 core-shell nanoparticles between Ti and Pt electrodes exhibited both analog and digital bipolar resistive switching depending on applied voltage. The resistance sequentially reduced with repeated -1.5V sweeps and pulses for 100 ms and increased as repeating +1.5 V. After forming at +3V, digital bipolar switching was achieved with SET transition from high to low resistance at +1 to 2V and reverse RESET transition at -1V. Pulse operation at +/- 2V led to identical bipolar switching, associated with facilitated interconnection of filament segments between Pt cores in nanoparticle layer. (C) 2014 AIP Publishing LLC.