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Appl Opt. 2000 Dec 10;39(35):6695-701.

Dynamic theory of crystallization in Ge2Sb2.3Te5 phase-change optical recording media.

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Optical Sciences Center, University of Arizona, Tucson, Arizona 85721, USA.


We develop a theory of the crystallization dynamics of Ge(2)Sb(2.3)Te(5) thin films that shows good qualitative agreement with experimental reflectivity results from a two-laser static tester. The theory is adapted from the nucleation theory of liquid droplets from supersaturated vapor and elucidates the physics underlying the amorphous-to-crystalline phase transformation under short-pulse excitation. In particular, the theory provides a physical picture in which crystalline islands, or basic embryos, are thermally activated in the amorphous material and subsequently grow as stable nuclei are formed.

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