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Ni/graphene/Ni nanostructures for spintronic applications.

Sumit Mandal1, Shyamal K Saha

  • 1Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India.

Nanoscale
|January 12, 2012
PubMed
Summary

Researchers synthesized graphene nano-spin valves with nickel ferromagnetic contacts. These structures exhibit antiferromagnetic coupling at room temperature, switching to parallel alignment under a magnetic field, causing significant magnetoresistance changes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique electronic properties make it a promising material for spintronic devices.
  • Nano-spin valves require precise control over ferromagnetic layer interactions and spin coupling.
  • Understanding spin interactions in nanoscale heterostructures is crucial for advancing electronic devices.

Purpose of the Study:

  • To chemically synthesize graphene-based nano-spin valve-like structures.
  • To investigate the magnetic coupling between ferromagnetic nickel layers on graphene.
  • To characterize the magnetoresistance behavior of these novel structures.

Main Methods:

  • Chemical synthesis of graphene sheets with nickel ferromagnetic layers on both sides.

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  • Magnetic measurements to determine spin coupling characteristics.
  • Magnetoresistance measurements to quantify device performance.

    • Main Results:

    • Successfully fabricated graphene-based nano-spin valve structures.
    • Observed antiferromagnetic coupling between nickel layers up to room temperature.
    • Demonstrated a magnetoresistance change of approximately 19% upon switching to parallel spin configuration at ~2000 Oe.

    Conclusions:

    • Graphene-nickel interfaces can support tunable spin coupling.
    • The synthesized structures exhibit promising spin-valve functionality.
    • These findings pave the way for graphene-based spintronic applications.