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@ARTICLE{Matsunaga:14072,
      author       = {Matsunaga, T. and Akola, J. and Kohara, S. and Honma, T.
                      and Kobayashi, K. and Ikenaga, E. and Jones, R. O. and
                      Yamada, N. and Takata, M. and Kojima, R.},
      title        = {{F}rom local structure to nanosecond recrystallization
                      dynamics in {A}g{I}n{S}b{T}e phase-change materials},
      journal      = {Nature materials},
      volume       = {10},
      issn         = {1476-1122},
      address      = {Basingstoke},
      publisher    = {Nature Publishing Group},
      reportid     = {PreJuSER-14072},
      year         = {2011},
      note         = {This work was supported by Core Research for Evolutional
                      Science and Technology (CREST) 'X-ray pinpoint structural
                      measurement project-Development of the spatial-and
                      time-resolved structural study for nano-materials and
                      devices' and by the Academy of Finland and the Japan Science
                      and Technology Agency through the Strategic Japanese-Finnish
                      Cooperative Program on 'Functional materials'. The
                      synchrotron radiation experiments were approved by the Japan
                      Synchrotron Radiation Research Institute (proposal Nos
                      2007A1223, 2008A1409 and 2009A12386), and all calculations
                      were carried out on the Jugene (IBM BlueGene/P) and Juropa
                      (Xeon 5570) computers in the Forschungszentrum Julich with
                      grants from the John von Neumann Institute for Computing and
                      the Forschungszentrum Julich. We thank N. Yasuda and Y.
                      Fukuyama for assistance in the density estimation
                      measurement and H-P. Komsa for providing the initial
                      648-atom system coordinates for crystalline AIST.},
      abstract     = {Phase-change optical memories are based on the
                      astonishingly rapid nanosecond-scale crystallization of
                      nanosized amorphous 'marks' in a polycrystalline layer.
                      Models of crystallization exist for the commercially used
                      phase-change alloy Ge(2)Sb(2)Te(5) (GST), but not for the
                      equally important class of Sb-Te-based alloys. We have
                      combined X-ray diffraction, extended X-ray absorption fine
                      structure and hard X-ray photoelectron spectroscopy
                      experiments with density functional simulations to determine
                      the crystalline and amorphous structures of
                      Ag(3.5)In(3.8)Sb(75.0)Te(17.7) (AIST) and how they differ
                      from GST. The structure of amorphous (a-) AIST shows a range
                      of atomic ring sizes, whereas a-GST shows mainly small rings
                      and cavities. The local environment of Sb in both forms of
                      AIST is a distorted 3+3 octahedron. These structures suggest
                      a bond-interchange model, where a sequence of small
                      displacements of Sb atoms accompanied by interchanges of
                      short and long bonds is the origin of the rapid
                      crystallization of a-AIST. It differs profoundly from
                      crystallization in a-GST.},
      keywords     = {J (WoSType)},
      cin          = {PGI-1},
      ddc          = {610},
      cid          = {I:(DE-Juel1)PGI-1-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Chemistry, Physical / Materials Science, Multidisciplinary
                      / Physics, Applied / Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21217690},
      UT           = {WOS:000286512200020},
      doi          = {10.1038/nmat2931},
      url          = {https://juser.fz-juelich.de/record/14072},
}