Fig. 1From: Compliance-Free ZrO2/ZrO2 − x /ZrO2 Resistive Memory with Controllable Interfacial Multistate Switching BehaviourXRD patterns of the as-deposited ZrO2/ZrO2 − x /ZrO2 tri-layer structure (red), oxygen-deficient ZrO2-x layer (green), stoichiometric ZrO2 layer (blue) and pure metallic Zr layer (pink)Back to article page