TY  - JOUR
AU  - Tabatabaei, Fatemeh
AU  - Boussinot, Guillaume
AU  - Spatschek, Robert
AU  - Apel, Markus
AU  - Brener, Efim
TI  - Phase field modeling of rapid crystallization in the phase-change material AIST
JO  - Applied physics / A
VL  - 122
IS  - 4
SN  - 0340-3793
CY  - Berlin
PB  - Springer
M1  - FZJ-2017-06019
SP  - 045108
PY  - 2017
AB  - We carry out phase field modeling as a continuum simulation technique in order to study rapid crystallization processes in the phase-change material AIST (Ag4In3Sb67Te26). In particular, we simulate the spatio-temporal evolution of the crystallization of a molten area of the phase-change material embedded in a layer stack. The simulation model is adapted to the experimental conditions used for recent measurements of crystallization rates by a laser pulse technique. Simulations are performed for substrate temperatures close to the melting temperature of AIST down to low temperatures when an amorphous state is involved. The design of the phase field model using the thin interface limit allows us to retrieve the two limiting regimes of interface controlled (low temperatures) and thermal transport controlled (high temperatures) dynamics. Our simulations show that, generically, the crystallization velocity presents a maximum in the intermediate regime where both the interface mobility and the thermal transport, through the molten area as well as through the layer stack, are important. Simulations reveal the complex interplay of all different contributions. This suggests that the maximum switching velocity depends not only on material properties but also on the precise design of the thin film structure into which the phase-change material is embedded.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000409414100029
DO  - DOI:10.1063/1.4996429
UR  - https://juser.fz-juelich.de/record/837003
ER  -