High-pressure induced structural changes in metastable Ge 2Sb2Te5 thin films: An X-ray absorption study

P. Fons; A. V. Kolobov; J. Tominaga; Y. Katayama

doi:10.1016/j.nimb.2005.06.039

High-pressure induced structural changes in metastable Ge ₂Sb₂Te₅ thin films: An X-ray absorption study

P. Fons, A. V. Kolobov, J. Tominaga, Y. Katayama

Research output: Contribution to journal › Conference article › peer-review

6 Citations (Scopus)

Abstract

Super-resolution (SR) media offer up to a factor of ten increase in areal storage density over conventional DVD media. Although SR has been realized, there is a strong need for a deeper understanding of structural and electronic changes in Ge₂Sb₂Te₅ (GST), a principal optical memory component, with external perturbations. Recording of SR disks leads to the formation of gas-phase bubbles that in turn lead to the development of large stresses on the underlying GST layer. In this paper we report on XAFS of nominally hydrostatic (0-10 GPa) compressive stress-induced structural changes of the metastable crystalline phase of GST. An analysis showed that the initial splitting of Ge-Te bond lengths of the room-temperature distorted rocksalt structure decreased to a small but finite splitting for p ≳ 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.

Original language	English
Pages (from-to)	160-162
Number of pages	3
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	238
Issue number	1-4
DOIs	https://doi.org/10.1016/j.nimb.2005.06.039
Publication status	Published - 2005 Aug
Externally published	Yes
Event	Synchrotron Radiation in Materials Science Proceedings of the 4th Conference on Synchrotron Radiation in Materials Science - Duration: 2004 Aug 23 → 2004 Aug 25

Keywords

Ge-Sb-Te
High-pressure
Optical memory
Structure
XAFS

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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High-pressure induced structural changes in metastable Ge ₂Sb₂Te₅ thin films : An X-ray absorption study. / Fons, P.; Kolobov, A. V.; Tominaga, J.; Katayama, Y.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 238, No. 1-4, 08.2005, p. 160-162.

Research output: Contribution to journal › Conference article › peer-review

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abstract = "Super-resolution (SR) media offer up to a factor of ten increase in areal storage density over conventional DVD media. Although SR has been realized, there is a strong need for a deeper understanding of structural and electronic changes in Ge2Sb2Te5 (GST), a principal optical memory component, with external perturbations. Recording of SR disks leads to the formation of gas-phase bubbles that in turn lead to the development of large stresses on the underlying GST layer. In this paper we report on XAFS of nominally hydrostatic (0-10 GPa) compressive stress-induced structural changes of the metastable crystalline phase of GST. An analysis showed that the initial splitting of Ge-Te bond lengths of the room-temperature distorted rocksalt structure decreased to a small but finite splitting for p ≳ 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.",

keywords = "Ge-Sb-Te, High-pressure, Optical memory, Structure, XAFS",

author = "P. Fons and Kolobov, {A. V.} and J. Tominaga and Y. Katayama",

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AU - Tominaga, J.

AU - Katayama, Y.

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N2 - Super-resolution (SR) media offer up to a factor of ten increase in areal storage density over conventional DVD media. Although SR has been realized, there is a strong need for a deeper understanding of structural and electronic changes in Ge2Sb2Te5 (GST), a principal optical memory component, with external perturbations. Recording of SR disks leads to the formation of gas-phase bubbles that in turn lead to the development of large stresses on the underlying GST layer. In this paper we report on XAFS of nominally hydrostatic (0-10 GPa) compressive stress-induced structural changes of the metastable crystalline phase of GST. An analysis showed that the initial splitting of Ge-Te bond lengths of the room-temperature distorted rocksalt structure decreased to a small but finite splitting for p ≳ 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.

AB - Super-resolution (SR) media offer up to a factor of ten increase in areal storage density over conventional DVD media. Although SR has been realized, there is a strong need for a deeper understanding of structural and electronic changes in Ge2Sb2Te5 (GST), a principal optical memory component, with external perturbations. Recording of SR disks leads to the formation of gas-phase bubbles that in turn lead to the development of large stresses on the underlying GST layer. In this paper we report on XAFS of nominally hydrostatic (0-10 GPa) compressive stress-induced structural changes of the metastable crystalline phase of GST. An analysis showed that the initial splitting of Ge-Te bond lengths of the room-temperature distorted rocksalt structure decreased to a small but finite splitting for p ≳ 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.

KW - Ge-Sb-Te

KW - High-pressure

KW - Optical memory

KW - Structure

KW - XAFS

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