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Noncontact Spin Pumping by Microwave Evanescent Fields.

Tao Yu1, Gerrit E W Bauer1,2

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Summary
This summary is machine-generated.

Researchers predict noncontact pumping of electron spin currents using magnetic nanostructures

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Area of Science:

  • Plasmonics and nano-optics
  • Condensed matter physics
  • Quantum mechanics

Background:

  • Evanescent light fields' angular momentum is explored in nano-optics and plasmonics.
  • This phenomenon has not been studied in the microwave regime.
  • Magnetic nanostructures generate evanescent stray fields.

Purpose of the Study:

  • To predict noncontact pumping of electron spin currents in conductors.
  • To investigate the role of evanescent stray fields from magnetic nanostructures.
  • To explore spin current generation in the microwave regime.

Main Methods:

  • Theoretical prediction of spin current generation.
  • Analysis of coherent photon-to-electron spin transfer.
  • Investigation of chirality in spin pumping currents.

Main Results:

  • Noncontact pumping of electron spin currents is predicted.
  • Coherent spin transfer is proportional to the g factor, significant in specific materials.
  • Chiral spin pumping occurs in systems with collective states, with exceptions in 1D systems like carbon nanotubes.

Conclusions:

  • Evanescent fields of magnetic nanostructures can drive electron spin currents.
  • The g factor plays a crucial role in efficient spin transfer.
  • Chirality of spin pumping is observed, even without interactions in certain 1D systems.