Resistance-dependent amplitude of random telegraph-signal noise in resistive switching memories

Ielmini, Daniele; Nardi, Federico; Cagli, Carlo
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053503
Academic Journal
Resistive-switching memory (RRAM) is attracting a considerable interest for the development of high-density nonvolatile memories. However, several scaling and reliability issues still affect the development path of RRAM. This work addresses random telegraph-signal noise (RTN) of the RRAM current, potentially affecting the memory stability. We show a clear resistance dependence of the RTN amplitude, and we propose a physical model describing the interaction of the localized current with a fluctuating defect. By estimating the diameter of the conductive filament, the model quantitatively accounts for the observed RTN amplitude, thus allowing for an analytical prediction of state stability in RRAMs.


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