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Universal Spin Diffusion Length in Polycrystalline Graphene.

Aron W Cummings1, Simon M-M Dubois2, Jean-Christophe Charlier2

  • 1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST , Campus UAB, Bellaterra , 08193 Barcelona , Spain.

Nano Letters
|September 19, 2019
PubMed
Summary
This summary is machine-generated.

Grain boundaries in chemical vapor deposition (CVD) graphene do not limit spin transport length. Spin diffusion length depends on substrate-induced spin-orbit coupling (SOC), not grain size, crucial for spintronics.

Keywords:
CVDGraphenegrain boundariespolycrystallinespin relaxationspintronics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Mechanics

Background:

  • Graphene grown by chemical vapor deposition (CVD) is a key material for industrial applications.
  • CVD graphene shows promise for spintronics, with spin transport measured over significant lengths despite polycrystalline nature.
  • The impact of grain boundaries (GBs) on spin relaxation in CVD graphene remains poorly understood.

Purpose of the Study:

  • To investigate the effect of grain boundaries (GBs) on spin relaxation in polycrystalline graphene.
  • To derive an effective model for spin transport in graphene GBs with spin-orbit coupling (SOC).
  • To evaluate spin transport in realistic CVD graphene morphologies.

Main Methods:

  • Utilized first-principles simulations to derive an effective tight-binding model.
  • Incorporated spin-orbit coupling (SOC) into the model for graphene GBs.
  • Evaluated spin transport in simulated polycrystalline graphene structures.

Main Results:

  • Spin diffusion length in CVD graphene is independent of grain size.
  • Spin transport is primarily determined by the strength of substrate-induced SOC.
  • The findings hold true even in the presence of quantum interference, consistent with the D'yakonov-Perel' mechanism.

Conclusions:

  • Grain boundaries in CVD graphene do not limit spin transport length.
  • Average grain size is not the determining factor for maximum spin transport in large-scale graphene spintronics.
  • These findings are crucial for optimizing graphene-based spintronic devices.