Articles


Document Type
Journal article (JA)
Title
Insight into the role of W in amorphous GeTe for phase-change memory
Author
Zhang, Linchuan(1); Miao, Naihua(2); Zhou, Jian(2); Mi, Jinxiao(1); Sun, Zhimei(2)
Address
(1) Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen; 361005, China; (2) School of Materials Science and Engineering, & Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing; 100191, China
RPAddress
Email
ResearchID
ORCID
Journal
Journal of Alloys and Compounds
Publisher
Elsevier Ltd
ISSN
0925-8388
Published
2018-03-25, 738:270-276.
JCR
2
ImpactFactor
3.133
ISBN
Fund_Code
HYMC
HYDD
HYKSRQ
HYJSRQ
HYLWLB
HYJB
Keywords
Amorphous materials - Calculations - Computer simulation - Data storage equipment - Digital storage - Electronic scales - Germanium - Germanium compounds - Molecular dynamics - Phase change materials - Storage (materials) - Tellurium compounds - Transition metals - Tungsten - Virtual storage
Abstract
GeTe is a fundamental material for phase-change memory, one of the most promising next-generation data storage devices. Doping GeTe with W has achieved both high writing (crystallization) speed at elevated temperature and long data retention (amorphous stability) at room temperature, which overcame a key challenge for phase-change memory. Yet the effect of W on amorphous GeTe remains ambiguous at atomic and electronic scales. By means of ab initio calculations and molecular dynamics (AIMD) simulations, we shed light on this issue and reveal that W would agglomerate during the melt-quench process and the chemically bonded W cluster plays a key role in tuning the overall phase-change performances of GeTe. Furthermore, the strong W-Ge and W-Te bonds show vital impact on the local structure and crystallization of amorphous GeTe as well. The present work provides valuable clues for advancing the understanding of transition metals doping effects on amorphous phase-change materials, and hence promotes the development of novel phase-change alloys with improved information storage performance. ? 2017 Elsevier B.V.
WOS Categories
Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
Accession Number
WOS:000419214800034
EI收录号
20175204580409
DOI
10.1016/j.jallcom.2017.12.212
ESI_Type
MATERIALS
Collection
SCIE, EI, SSCI

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