Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-02-12
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
25 pages, 8 figures
Scientific paper
We have studied resistive bistability (memory) effects in junctions based on metal oxides, with a focus on sample-to-sample reproducibility which is necessary for the use of such junctions as crosspoint devices of hybrid CMOS/nanoelectronic circuits. Few-nm-thick layers of NbOx, CuOx and TiOx have been formed by thermal and plasma oxidation, at various deposition and oxidation conditions, both with or without rapid thermal post-annealing (RTA). The resistive bistability effect has been observed for all these materials, with particularly high endurance (over 1000 switching cycles) obtained for single-layer TiO2 junctions, and the best reproducibility reached for multi-layer junctions of the same material. Fabrication optimization has allowed us to improve the OFF/ON resistance ratio to about 1000, but the sample-to-sample reproducibility is so far lower than that required for large scale integration.
Likharev Konstantin K.
Patel Vijay
Su Dong
Tan Zhongkui
Zhu Yimei
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