Using Current to Drive Two SDC Memristors Connected in Series and in Anti-Series

Networks of bipolar memristors have a rich collective switching behavior, which can be exploited in computing applications. Such a small network is formed by a pair of bipolar memristors connected in a series or anti-series configuration. The latter is known as complementary resistive switch (CRS), and has been studied for memory and for logic applications. While CRS structures have been investigated with voltage-based driving schemes, the collective behavior of current-driven networks of memristors has not yet been explored. To this end, here we present preliminary experimental results from two bipolar self-directed channel (SDC) memristors by Knowm Inc., connected in series with the same or the opposite polarity, driven by current. The amplitude of the applied current pulses varied between |0.1 uA| and |1.0 uA|. The results demonstrate that current-based driving is effective for programming simultaneously memristors that are connected in series. Moreover, the devices in the CRS configuration respond in a complementary way to the applied input current. We observed a stable and uniform performance of the devices in all our experiments. Current pulses of |0.1 uA| did not affect the state of the memristors, so they can be used to perform READ operations in current-driven resistive memory modules.