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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Quantum Materials

Background:

  • Investigating the electrical response of diffusive metals connected by magnetic insulators.
  • Exploring the role of topologically stable spin currents in magnetic systems.

Purpose of the Study:

  • To demonstrate and characterize spin superfluidity in a magnetic insulator.
  • To explore the generation of magnetoresistance from induced spin supercurrents.
  • To investigate the feasibility of AC current driving for coherent spin transport.

Main Methods:

  • Studying the electrical response of metal-insulator-metal junctions.
  • Inducing spin currents via charge currents in the metals.
  • Analyzing magnetoresistance dependence on circuit topology and phase coherence.
  • Employing AC current driving to probe spin transport dynamics.

Main Results:

  • Observed magnetoresistance directly evidencing spin superfluidity due to phase coherence.
  • Demonstrated AC current enables coherent spin transport despite magnetic anisotropy.
  • Identified resonance peaks in AC spin transmission for material property extraction.

Conclusions:

  • AC transport provides a viable route for non-equilibrium coherent spin transport.
  • AC transport measurements can characterize static and dynamic magnetic properties.
  • This work serves as a precursor for realizing DC spin superfluid transport.