2 Phase Change Memory
Among all memory technologies introduced in this book, phase change memory (PCM) is probably the closest to the commercialization stage. Similarly, PCM has two or more distinct resistance states that represent the different logic values. Data storage, however, is based on switching between the amorphous phase with high electrical resistivity and the crystalline phase(s) with low electrical resistivity.
2.1 Introduction to PCM
2.1.1 Phase Change Properties
A phase-change material usually has two or more phases with quite different electrical properties, as shown in Figure 2.1. The materials can switch among these phases repeatedly and stably under some conditions; that is, under heating for certain lengths of time. As ...
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