Reference : Aging mechanisms in amorphous GeTe
Scientific congresses and symposiums : Unpublished conference/Abstract
Physical, chemical, mathematical & earth Sciences : Physics
Aging mechanisms in amorphous GeTe
Raty, Jean-Yves mailto [Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés >]
Zhang, Wei []
Luckas, Jennifer []
Mazzarello, Riccardo []
Bichara, Christophe []
Wuttig, Matthias []
2015 Glass & Optical Materials Division and Deutsche Glastechnische Gesellschaft ACerS GOMD–DGG Joint Meeting
17-05-2015 to 21-05-2015
American Ceramics Society and Deutsche Glass Gesellschaft
[en] ab initio ; phase change materials ; Molecular dynamics ; aging ; drift ; glasses
[en] Aging phenomena are common to all amorphous structures, but
of special importance in phase change materials (PCM) since it
impedes the realization of multi-level memories. Different interpretations
have been proposed, but we focus here on the structural
relaxation of amorphous GeTe, chosen because it is the simplest
system that is representative of the wider class of GST alloys, lying
along the GeTe-Sb2Te3 composition line of the GeSbTe phase
diagram. We investigate the structure of amorphous GeTe using
Density Functional Theory based Molecular Dynamics, using either
the standard Generalized Gradient Approximation, or more elaborate
Van der Waals approximation. New insight is provided on the
stability of homopolar GeGe bonds and tetrahedral Ge bonding,
in relation with the resistance drift phenomenon, that is investigated
experimentally using photothermal deflection spectroscopy
Physique des Solides, Interfaces et Nanostructures
F.R.S.-FNRS - Fonds de la Recherche Scientifique ; CFB - Communauté française de Belgique ; DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Energie ; ULiège - Université de Liège
Researchers ; Professionals ; Students ; General public

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