Projected mushroom-type phase-change memory

TL;DR

This paper investigates the projection mechanism in mushroom-type phase-change memory devices, focusing on how phase configurations and resistance stability can improve in-memory computing precision.

Contribution

It provides a detailed analysis of the projection mechanism in nanoscale mushroom-type phase-change memory devices, highlighting their fundamental operation and potential for enhanced computational stability.

Findings

Key attributes of resistance and phase configurations are characterized.

Projection mechanism can mitigate resistance drift issues.

Insights into device operation improve understanding of phase-change memory.

Abstract

Phase-change memory devices have found applications in in-memory computing where the physical attributes of these devices are exploited to compute in place without the need to shuttle data between memory and processing units. However, non-idealities 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 we investigate the projection mechanism in a prominent phase-change memory device architecture, namely mushroom-type phase-change memory. Using nanoscale projected Ge2Sb2Te5 devices we study the key attributes of state-dependent resistance, drift coefficients, and phase configurations, and using them reveal how these devices fundamentally work.