2020 BRN Discussion, page-405

An article on phase-change materials is at a pay-for-view site at:
https://www.sciencedirect.com/science/article/pii/B9780444640628000140
ABSTRACT
Phase-change chalcogenides, specifically those containing tellurium, have amorphous/glassy phases that can undergo fast crystallization. The crystallization time is short, < 100 ns, challenging to measure, and it is the rate-limiting step of nonvolatile, low-power phase-change memory (PCM) operation. Reversible glassy-to-crystalline transitions are the key processes in writing (crystallization) and erasing (amorphization) steps in PCM devices. This chapter provides a basic overview of recent research on materials in PCM technology, describing developments in experimental techniques. The emphasis is on ultrafast calorimetry, and on how the data from this relatively novel technique can be used in modeling the transitions, particularly crystal growth rate and understanding the different crystallization mechanisms. Different forms of the temperature-dependent mobility in the supercooled liquid state are shown to have direct technological importance for memory operation.

It doesn't seem a particularly elegant technique, but I'm old school.