Unpublished conference/Abstract (Scientific congresses and symposiums)
Phase Change Materials for Non-Volatile Memories : Properties and Optimization through Ab Initio Simulation (Invited)
Raty, Jean-Yves
2019236 ECS (Electrochemical Society) meeting
Editorial reviewed
 

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Keywords :
ab initio; phase change materials; ovonic threshold switching
Abstract :
[en] Phase Change Materials are emerging as active components of non-volatile memories thanks to their ability to switch extremely rapidly from a conducting crystal to a more semiconducting glassy. Using Ab Initio simulations, we address the structure and some properties of the glassy phase, like aging, but also go back to the description of bonding in the crystalline phase. We develop a two-dimensional map based on a quantum-topological description of electron sharing and electron transfer in binary solids. This map intuitively identifies the fundamental nature of ionic, metallic, and covalent bonding in a range of elements and binary materials. Furthermore, it highlights a distinct region where phase change materials are found and for which bonding has been qualified as ‘metavalent’ [1,2]. Extending this map into the third dimension by including physical properties of application interest, we show that bonding in metavalent compounds differs from the our usual views of bonding. This map could be used to help designing new materials: by searching for desired properties in a 3D space and then mapping this back onto the 2D plane of bonding. [1] J.Y. Raty, M. Schumacher, P. Golub, V. Deringer, C. Gatti and M. Wuttig Advanced Materials, (2018) 1806280 [2] M. Wuttig, V. Deringer, X. Gonze, C. Bichara and J.Y. Raty, Advanced Mater. (2018) 1803777 Work funded by F.R.S.-FNRS & the Region Wallonne (CECI Tier-1) and the Federation Wallonie-Bruxelles (ARC AIMED)
Disciplines :
Physics
Author, co-author :
Raty, Jean-Yves  ;  Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures
Language :
English
Title :
Phase Change Materials for Non-Volatile Memories : Properties and Optimization through Ab Initio Simulation (Invited)
Publication date :
2019
Event name :
236 ECS (Electrochemical Society) meeting
Event organizer :
Electrochemical Society
Event place :
Atlanta, United States
Event date :
du 13 au 17 octobre 2019
By request :
Yes
Audience :
International
Peer reviewed :
Editorial reviewed
Tags :
Tier-1 supercomputer
Name of the research project :
ARC AIMED
ANR Sesame
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Région wallonne [BE]
ANR - Agence Nationale de la Recherche [FR]
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since 24 January 2020

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