Sub-nanosecond time-resolved structural measurements of the phase-change alloy Ge2Sb2Te5

Paul Fons, A. V. Kolobov, Toshio Fukaya, Motohiro Suzuki, Tomoya Uruga, Naomi Kawamura, Masafumi Takagaki, Hitoshi Ohsawa, Hajime Tanida, Junji Tominaga

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Phase-change alloys constitute the basis for a widening collection of storage technologies both optical and electrical. These uses of phase-change alloys are characterized by switching material properties either by laser irradiation or by an electric current on the nanosecond time scale. Considering the conflicting requirements for high-speed switching, yet long term data storage integrity, a deeper understanding of the switching processes in these materials is essential for insightful application development. We have used synchrotron-based time-resolved X-ray absorption fine structure spectroscopy (XAFS), a technique equally suitable for amorphous and crystalline phases to elaborate details in structural changes in the phase-change process on a sub-nanosecond time scale using optical pump/X-ray probe techniques. In this work, we present initial results of sub-nanosecond laser excitation of the laser-reamorphized state of Ge2Sb2Te5. The technique is general and can be applied to a wide variety of nanoscale structures.

Original languageEnglish
Pages (from-to)3711-3714
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number6 B
Publication statusPublished - 2007 Jun 22
Externally publishedYes


  • Phase-change materials
  • Time-resolved
  • X-ray absorption

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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