Non-Melting Phase Change Memory – Topological-Switching RAM (TRAM)

Superlattice phase change memory (PRAM) of the repeated films of [Sb₂Te₃/GeTe], we call this memory "TRAM", Topological-switching RAM, was studied to show some evidences of non-melting features compared to that of the conventional alloy PRAM, e.g. Ge₂Sb₂Te₅. One evidence was very fast switching with the shorter and the rectangular pulses in both SET and RESET. Other evidence was direct observation of the TRAM using TEM after 10 million switching cycles.