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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Spintronics

Background:

  • The superconducting diode effect, characterized by a nonreciprocal critical current, arises from the interplay of magnetism and superconductivity.
  • Previous studies on superconductor/ferromagnet (S/F) bilayers demonstrated this effect, but the underlying mechanism remained elusive.
  • The Fulde-Ferrell-Larkin-Ovchinikov (FFLO) state was a proposed, though unconfirmed, mechanism due to symmetry breaking.

Purpose of the Study:

  • To directly observe and elucidate the mechanism responsible for the superconducting vortex diode effect in S/F bilayers.
  • To investigate the role of asymmetric vortex dynamics in generating a nonreciprocal critical current.
  • To establish a foundational understanding for the development of novel superconducting devices.

Main Methods:

  • Utilized a nanoscale SQUID-on-tip (SOT) microscope for direct observation of vortex dynamics.
  • Performed in-situ transport measurements to complement microscopic observations.
  • Developed a theoretical model to explain the observed phenomena and experimental results.

Main Results:

  • Directly observed asymmetric vortex dynamics in Nb/EuS (S/F) bilayers.
  • Identified screening currents induced by stray magnetic fields from the ferromagnet layer as the cause of nonreciprocal critical current.
  • Validated the theoretical model with experimental data, confirming the mechanism.

Conclusions:

  • The vortex diode effect in S/F bilayers is driven by screening currents from the ferromagnet layer.
  • This finding clarifies the origin of the nonreciprocal critical current in these systems.
  • Provides a basis for designing new superconducting electronic devices leveraging this effect.