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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • The Rashba effect, arising from spin-orbit coupling (SOC) in confined electron systems, links electron spin and momentum.
  • While theoretically promising for spin-charge conversion, experimental evidence at metal surfaces/interfaces has been limited.
  • Efficient spin-charge conversion is crucial for developing next-generation spintronic devices.

Purpose of the Study:

  • To experimentally demonstrate and quantify spin-charge conversion at a metal interface utilizing the Rashba effect.
  • To investigate the role of the bismuth/silver (Bi/Ag) interface in mediating the Rashba-induced spin-charge conversion.
  • To establish the potential of Rashba interfaces for practical spintronic applications.

Main Methods:

  • Utilized spin pumping to inject a spin current from a nickel-iron (NiFe) layer into a Bi/Ag bilayer.
  • Measured the resulting charge current generated through spin-charge conversion.
  • Performed control experiments using only Bi or Ag layers to isolate the interface effect.

Main Results:

  • Observed a significant charge current signal, directly attributable to spin-charge conversion at the Bi/Ag interface.
  • Demonstrated that the charge signal was negligible when using only Bi or Ag, confirming the interface's crucial role.
  • Quantified the efficiency of spin-charge conversion mediated by the Rashba coupling at the Bi/Ag interface.

Conclusions:

  • The Bi/Ag interface exhibits a strong Rashba effect enabling efficient spin-to-charge conversion.
  • This study provides clear experimental evidence for spin-charge conversion at a metal interface.
  • Rashba interfaces offer a promising pathway for developing highly efficient spintronic devices.