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The technological success of phase-change materials in the field of data storage and functional systems stems from their distinctive electronic and structural peculiarities on the nanoscale. Recently, superlattice structures have been demonstrated to dramatically improve the optical and electrical performances of these chalcogenide based phase-change materials. In this perspective, unravelling the atomistic structure that originates the improvements in switching time and switching energy is paramount in order to design nanoscale structures with even enhanced functional properties. This study reveals a high-resolution atomistic insight of the [GeTe/Sb 2 Te 3] interfacial structure by means of Extended X-Ray Absorption Fine Structure spectroscopy and Transmission Electron Microscopy. Based on our results we propose a consistent novel structure for this kind of chalcogenide superlattices.
Nature Publishing Group
Publication date: 
1 Mar 2016

Barbara Casarin, Antonio Caretta, Jamo Momand, Bart J Kooi, Marcel A Verheijen, Valeria Bragaglia, Raffaella Calarco, Marina Chukalina, Xiaoming Yu, John Robertson, Felix RL Lange, Matthias Wuttig, Andrea Redaelli, Enrico Varesi, Fulvio Parmigiani, Marco Malvestuto

Biblio References: 
Volume: 6 Issue: 1 Pages: 1-8
Scientific reports