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Conductive-bridging memory can store information as different resistance states even when not powered. In order to check reliability challenges for nonvolatile-memory applications, the data retention has to be tested carefully. This letter describes a new test scheme using electrical bias for acceleration and enables the fast recording of such detailed information. Experimental data for memory devices based on Ag:GeS2 as the active-matrix material are presented. Excellent stability and reproducibility of the resistance states for more than 300 cycles are demonstrated in the temperature range from 25degC to 85degC. Based on the calculated activation energy, ten years of data retention is extrapolated.
Date of Publication: Aug. 2009