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In this study, we have investigated the multi-level cell (MLC) characteristics and variability analysis of multiple resistance states of one of the most promising and extensively studied binary oxide (HfOx) based nanometer scale RRAM stack by varying the switching current. The device size and thickness of stack layers were confirmed by transmission electron microscope (TEM) images. In the CMOS friendly...
Multilevel cell (MLC) storage technology is attractive in achieving ultrahigh density memory with low cost. In this letter, we have demonstrated 3-bit per cell storage characteristics in a TaOx-based RRAM. By analyzing the key requirements for MLC operation mainly the switching uniformity and stability of resistance levels, an engineered stack based on thermodynamics in top electrode/(vacancy reservoir/defect...
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