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Phase‐change memory devices have found applications in in‐memory computing where the physical attributes of these devices are exploited to compute in places without the need to shuttle data between memory and processing units. However, nonidealities such as temporal variations in the electrical resistance have a detrimental impact on the achievable computational precision. To address this, a promising approach is projecting the phase configuration of phase change material onto some stable element within the device. Here, the projection mechanism in a prominent phase‐change memory device architecture, namely mushroom‐type phase‐change memory, is investigated. Using nanoscale projected Ge 2 Sb 2 Te 5  devices, the key attributes of state‐dependent resistance, drift coefficients, and phase configurations are studied, and using them how these devices fundamentally work is understood.

Projected Mushroom Type Phase‐Change Memory