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Novel hypostasis of old materials in oxide electronics: metal oxides for resistive random access memory applications

Transition-metal oxide films, demonstrating the effects of both threshold and nonvolatile memory resistive switching, have been recently proposed as candidate materials for storage-class memory. In this work we describe some experimental results on threshold switching in a number of various transition metal (V, Ti, Fe, Nb, Mo, W, Hf, Zr, Mn, Y, and Ta) oxide films obtained by anodic oxidation. Then, the results concerning the effects of bistable resistive switching in MOM and MOS structures on the basis of such oxides as V2O5, Nb2O5, and NiO are presented. It is shown that sandwich structures on the basis of the Au/V2O5/SiO2/Si, Nb/Nb2O5/Au, and Pt/NiO/Pt can be used as memory elements for ReRAM applications. Finally, model approximations are developed in order to describe theoretically the effect of nonvolatile unipolar switching in Pt NiO-Pt structures.