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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin diffusion and torques in disordered antiferromagnets.

Aurelien Manchon1

  • 1Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 2, 2017
PubMed
Summary
This summary is machine-generated.

We developed a drift-diffusion equation for spin transport in antiferromagnets. This allows tracking spin evolution and understanding spin transfer torque in various magnetic device configurations.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Quantum Transport

Background:

  • Metallic antiferromagnets offer novel spintronic functionalities.
  • Understanding spin dynamics in these materials is crucial for device applications.
  • Existing models often lack a comprehensive description of spin transport in bipartite antiferromagnets.

Purpose of the Study:

  • To develop a theoretical framework for spin transport in collinear bipartite metallic antiferromagnets.
  • To investigate the spin transfer torque in different antiferromagnetic device architectures.
  • To explore the possibility of self-torque in antiferromagnets due to the spin Hall effect.

Main Methods:

  • Derivation of a drift-diffusion equation from a tight-binding Hamiltonian using Keldysh formalism.
  • Application of Wigner expansion to obtain quantum kinetic equations.
  • Analysis of spin accumulation and spin current evolution on each sublattice.
  • Investigation of spin transfer torque in ferromagnet-antiferromagnet spin-valves, antiferromagnet-heavy metal bilayers, and single antiferromagnets.

Main Results:

  • The developed drift-diffusion equations accurately describe spin transport in bipartite antiferromagnets.
  • The theory elucidates the mechanisms of spin transfer torque in various device configurations.
  • A non-vanishing spin Hall effect in antiferromagnets can lead to a self-torque phenomenon.

Conclusions:

  • The new drift-diffusion formalism provides a powerful tool for studying spin dynamics in metallic antiferromagnets.
  • The findings offer insights into the control of magnetization dynamics in spintronic devices.
  • The self-torque effect in antiferromagnets opens new avenues for designing advanced spintronic functionalities.