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@ARTICLE{Pries:867961,
author = {Pries, Julian and Wei, Shuai and Wuttig, Matthias and
Lucas, Pierre},
title = {{S}witching between {C}rystallization from the {G}lassy and
the {U}ndercooled {L}iquid {P}hase in {P}hase {C}hange
{M}aterial {G}e 2 {S}b 2 {T}e 5},
journal = {Advanced materials},
volume = {31},
number = {39},
issn = {1521-4095},
address = {Weinheim},
publisher = {Wiley-VCH},
reportid = {FZJ-2019-06554},
pages = {1900784 -},
year = {2019},
abstract = {Controlling crystallization kinetics is key to overcome the
temperature–time dilemma in phase change materials
employed for data storage. While the amorphous phase must be
preserved for more than 10 years at slightly above room
temperature to ensure data integrity, it has to crystallize
on a timescale of several nanoseconds following a moderate
temperature increase to near 2/3 Tm to compete with other
memory devices such as dynamic random access memory (DRAM).
Here, a calorimetric demonstration that this striking
variation in kinetics involves crystallization occurring
either from the glassy or from the undercooled liquid state
is provided. Measurements of crystallization kinetics of
Ge2Sb2Te5 with heating rates spanning over six orders of
magnitude reveal a fourfold decrease in Kissinger activation
energy for crystallization upon the glass transition. This
enables rapid crystallization above the glass transition
temperature Tg. Moreover, highly unusual for glass‐forming
systems, crystallization at conventional heating rates is
observed more than 50 °C below Tg, where the atomic
mobility should be vanishingly small.},
cin = {PGI-10},
ddc = {660},
cid = {I:(DE-Juel1)PGI-10-20170113},
pnm = {521 - Controlling Electron Charge-Based Phenomena
(POF3-521)},
pid = {G:(DE-HGF)POF3-521},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31385632},
UT = {WOS:000479612900001},
doi = {10.1002/adma.201900784},
url = {https://juser.fz-juelich.de/record/867961},
}