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Magnetic random access memory (MRAM).

Yuankai Zheng1, Yihong Wu, Kebin Lil

  • 1Data Storage Institute, 5 Engineering Drive 1, Republic of Singapore, 117608.

Journal of Nanoscience and Nanotechnology
|April 26, 2007
PubMed
Summary
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This review examines magnetic tunnel junction (MTJ) magnetoresistive random-access memory (MRAM) operations. It details reading and writing techniques, focusing on thermal effects for enhanced reliability and efficiency in high-density MRAM devices.

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Computer Engineering

Background:

  • Nonvolatile magnetic tunnel junction (MTJ) Magnetoresistive Random-Access Memory (MRAM) offers high density and speed.
  • Optimizing reading and writing operations is crucial for MRAM performance.

Purpose of the Study:

  • To review the reading and writing operations of high-density, high-speed nonvolatile MTJ MRAMs.
  • To analyze cell efficiency, reading reliability, and various writing modes.
  • To investigate the role of thermal factors in MRAM stability and reliability.

Main Methods:

  • Systematic analysis of cross-point cell layout structures.
  • Theoretical and experimental investigation of different writing operation modes.
  • Discussion of sensing schemes and reference resistance generation for reading.

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Main Results:

  • Reference resistance schemes enhance cell efficiency and reading reliability.
  • Cross-point cell structures are suitable for high-density, low-cost MRAM.
  • Various writing modes, including spin transfer switching and thermally assisted writing, were investigated.
  • Thermal factors significantly influence thermal stability and reading/writing reliability.

Conclusions:

  • Optimized sensing schemes and cell structures are key for efficient MRAM reading.
  • Understanding diverse writing mechanisms, including thermal effects, is vital for MRAM development.
  • Thermal stability is a critical parameter affecting overall MRAM performance and reliability.