Universität zu Köln

Malvestuto, Marco, Caretta, Antonio, Casarin, Barbara, Cilento, Federico ORCID: 0000-0002-4121-1694, Dell'Angela, Martina ORCID: 0000-0003-1228-2458, Fausti, Daniele, Calarco, Raffaella, Kooi, Bart J. ORCID: 0000-0002-0311-4105, Varesi, Enrico, Robertson, John and Parmigiani, Fulvio (2016). Ultrafast Ge-Te bond dynamics in a phase-change superlattice. Phys. Rev. B, 94 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

A long-standing question for avant-garde data storage technology concerns the nature of the ultrafast photoinduced phase transformations in the wide class of chalcogenide phase-change materials (PCMs). Overall, a comprehensive understanding of the microstructural evolution and the relevant kinetics mechanisms accompanying the out-of-equilibrium phases is still missing. Here, after overheating a phase-change chalcogenide superlattice by an ultrafast laser pulse, we indirectly track the lattice relaxation by time resolved x-ray absorption spectroscopy (tr-XAS) with a sub-ns time resolution. The approach to the tr-XAS experimental results reported in this work provides an atomistic insight of the mechanism that takes place during the cooling process; meanwhile a first-principles model mimicking the microscopic distortions accounts for a straightforward representation of the observed dynamics. Finally, we envisage that our approach can be applied in future studies addressing the role of dynamical structural strain in PCMs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Malvestuto, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Caretta, Antonio UNSPECIFIED UNSPECIFIED UNSPECIFIED Casarin, Barbara UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, Federico UNSPECIFIED orcid.org/0000-0002-4121-1694 UNSPECIFIED Dell'Angela, Martina UNSPECIFIED orcid.org/0000-0003-1228-2458 UNSPECIFIED Fausti, Daniele UNSPECIFIED UNSPECIFIED UNSPECIFIED Calarco, Raffaella UNSPECIFIED UNSPECIFIED UNSPECIFIED Kooi, Bart J. UNSPECIFIED orcid.org/0000-0002-0311-4105 UNSPECIFIED Varesi, Enrico UNSPECIFIED UNSPECIFIED UNSPECIFIED Robertson, John UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-261978
DOI:	10.1103/PhysRevB.94.094310
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	9
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CHANGE MEMORY MATERIALS; CHALCOGENIDE SUPERLATTICES; SWITCHING MECHANISM; DATA-STORAGE; THIN-FILMS; TRANSITIONS; GENERATION; PULSES Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26197