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Josephson junction through a thin ferromagnetic layer: negative coupling.

T Kontos1, M Aprili, J Lesueur

  • 1CSNSM-CNRS, Université Paris-Sud, 91405 Orsay Cedex, France.

Physical Review Letters
|September 13, 2002
PubMed
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We observed damped oscillations in critical current in superconductor-ferromagnet-superconductor junctions. This is due to quasiparticle exchange energy at the interface, leading to predictable 0-to-pi transitions.

Area of Science:

  • Condensed matter physics
  • Superconductivity
  • Spintronics

Background:

  • Josephson coupling describes current flow between superconductors separated by a thin barrier.
  • Ferromagnetic materials introduce unique spin-dependent effects into superconducting devices.
  • Understanding superconductor-ferromagnet interfaces is crucial for novel electronic applications.

Purpose of the Study:

  • To investigate the influence of ferromagnetic thin films on Josephson coupling.
  • To analyze the relationship between critical current and ferromagnetic layer thickness.
  • To elucidate the underlying physical mechanisms governing the observed phenomena.

Main Methods:

  • Fabrication of superconductor-insulator-ferromagnet-superconductor (SIFS) planar junctions.

Related Experiment Videos

  • Measurement of critical current as a function of ferromagnetic layer thickness.
  • Analysis of quasiparticle Andreev reflection at superconductor-ferromagnet interfaces.

    • Main Results:

    • Observed damped oscillations in critical current with varying ferromagnetic layer thickness.
    • Attributed oscillations to exchange energy modulation during quasiparticle Andreev reflection.
    • Demonstrated critical current cancellation at the 0-to-pi coupling transition.

    Conclusions:

    • Ferromagnetic thin films significantly modulate Josephson coupling.
    • Quasiparticle exchange interaction at the interface is the primary driver of observed oscillations.
    • The study confirms theoretical predictions for 0- and pi-junction behavior in SIFS systems.