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Structure of phase change materials for data storage.

Zhimei Sun1, Jian Zhou, Rajeev Ahuja

  • 1Condensed Matter Theory Group, Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden. zhimei.sun@fysik.uu.se

Physical Review Letters
|February 21, 2006
PubMed
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Chalcogenide phase change materials enable optical and electrical memory. Ab initio calculations reveal their atomic structure, clarifying the fast, reversible phase transition mechanism.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Phase change materials (PCMs) based on chalcogenide alloys are crucial for optical and electrical memory devices.
  • Their functionality depends on reversible transitions between amorphous and metastable cubic states.
  • The precise atomic arrangements and phase change mechanisms remain unclear.

Purpose of the Study:

  • To determine the atomic arrangements of chalcogenide alloys in their metastable cubic state.
  • To elucidate the underlying mechanism responsible for the fast and reversible phase transitions.

Main Methods:

  • Utilizing first-principles ab initio calculations.
  • Analyzing the atomic structures and symmetries of the phase change materials.

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Main Results:

  • The metastable cubic structure comprises specific repeated units with rocksalt symmetry.
  • Apparent vacancy positions are revealed to be highly ordered and layered, arising from cubic symmetry.
  • The amorphous and metastable states exhibit significant structural similarity.

Conclusions:

  • The atomic structure of the metastable cubic state has been precisely determined.
  • The phase change mechanism is attributed to the intrinsic structural similarity between amorphous and metastable states.
  • This clarifies the utilization of chalcogenide PCMs in memory applications.