(color online) Ultralow-power graphene RRAM.^[48] (a) Schematics of GMDs (graphene memory devices) and PtMDs (Pt memory devices). (b) Switching characteristics of PtMD (red), high-quality GMD (blue), and low quality GMD (green), respectively. (c) The resistance and power distribution of PtMDs and GMDs with graphene of different quality. Red: PtMDs; blue: GMDs with high quality graphene; green: GMDs with low quality graphene. (d) The resistance and power distribution of PtMDs and GMDs with graphene of different quality. The error bars represent the minimum and maximum measured values. Red: PtMDs; blue: GMDs with high quality graphene; green: GMDs with low quality graphene.