Scaling behaviors of reset voltages and currents in unipolar resistance switching

Abstract

The wide distributions of switching voltages in unipolar switching currently pose major obstacles for scientific advancement and practical applications. Using NiO capacitors, we investigated the distributions of the reset voltage and current. We found that they scaled with the resistance value R-o in the low resistance state and that the scaling exponents varied at R-o approximate to 30 Omega. We explain these intriguing scaling behaviors and their crossovers by analogy with percolation theory. We show that the connectivity of conducting filaments plays a crucial role in the reset process.