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Bipolar switching in chalcogenide phase change memory.

N Ciocchini1, M Laudato1, M Boniardi2

  • 1Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza L. da Vinci 32-20133 Milano, Italy.

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|July 6, 2016
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This study introduces bipolar switching for phase change memory (PCM) using chalcogenide materials. This novel operation improves the temperature stability of the high resistance state, crucial for reliable nonvolatile memory applications.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Solid-State Physics

Background:

  • Chalcogenide phase change materials are vital for optical and electrical nonvolatile memory (phase change memory, PCM).
  • The amorphous phase in PCM is prone to structural relaxation and crystallization at low temperatures, limiting device stability.
  • Improving the time/temperature stability of PCM is essential for advanced memory applications.

Purpose of the Study:

  • To investigate novel operation modes for phase change memory (PCM) to enhance temperature stability.
  • To demonstrate and interpret the bipolar switching operation in chalcogenide-based PCM.

Main Methods:

  • Implementation of bipolar switching operation in phase change memory devices.
  • Analysis of ion migration mechanisms under elevated temperature and electric fields.
  • Experimental demonstration of improved high resistance state stability.

Main Results:

  • Bipolar switching operation was successfully demonstrated in chalcogenide PCM.
  • Ion migration in the solid state was identified as the mechanism behind bipolar switching.
  • Enhanced temperature stability of the high resistance state was achieved and validated.

Conclusions:

  • Bipolar switching offers a promising new operational mode for phase change memory (PCM).
  • The observed stability improvements are attributed to local chemical species depletion from the electrode region.
  • This approach enhances the reliability and operational temperature range of PCM devices.