Multi-contact Phase Change Toggle Logic Device Utilizing Thermal Crosstalk

Phase change memory (PCM) is an emerging high speed, high density, high endurance, and scalable nonvolatile memory technology which utilizes the large resistivity contrast between the amorphous and crystalline phases of chalcogenide materials such as Ge₂Sb₂Te₅, (GST). In addition to being used as a standalone memory, there has been a growing interest in integration of PCM devices on top of the CMOS layer for computation in memory and neuromorphic computing. The large CMOS overhead for memory controllers is a limiting factor for this purpose. Transferring functionality like routing, multiplexing, and logic to the memory layer can substantially reduce the CMOS overhead, making it possible to integrate 100s of GB of PCM storage on top of a conventional CPU [1], [2].