On a positive note, it appears filamentary has demonstrated a 7nm cell (noted in 2015 https://semiengineering.com/reram-gains-steam/), which is promising for area based reram, as there is no filament to restrict size.
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Crossbar uses silver atoms suspended in an amorphous silicon matrix. Under write voltage, atoms from a top silver layer migrate into the matrix to form bridges of conductive metal filaments. “These filaments are only 3nm in diameter, but create a very large on/off ratio,” Dubois said. The company has published results for a 7nm read cell.
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