Change search
ReferencesLink to record
Permanent link

Direct link
Structure of phase change materials for data storage
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2006 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 96, no 5Article in journal (Refereed) Published
Abstract [en]

Phase change materials based on chalcogenide alloys play an important role in optical and electrical memory devices. Both applications rely on the reversible phase transition of these alloys between amorphous and metastable cubic states. However, their atomic arrangements are not yet clear, which results in the unknown phase change mechanism of the utilization. Here using ab initio calculations we have determined the atomic arrangements. The results show that the metastable structure consists of special repeated units possessing rocksalt symmetry, whereas the so-called vacancy positions are highly ordered and layered and just result from the cubic symmetry. Finally, the fast and reversible phase change comes from the intrinsic similarity in the structures of the amorphous and metastable states.

Place, publisher, year, edition, pages
2006. Vol. 96, no 5
Keyword [en]
initio molecular-dynamics, ge2sb2te5 thin-films, electron-diffraction, optical memory, crystallization, transitions, microscopy, germanium, disk
URN: urn:nbn:se:kth:diva-15416DOI: 10.1103/PhysRevLett.96.055507ISI: 000235252200047ScopusID: 2-s2.0-33244486323OAI: diva2:333457
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Ahuja, Rajeev
By organisation
Materials Science and Engineering
In the same journal
Physical Review Letters

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 15 hits
ReferencesLink to record
Permanent link

Direct link