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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Controlling supercurrents and their spatial distribution in ferromagnets.

Kaveh Lahabi1, Morten Amundsen2, Jabir Ali Ouassou2

  • 1Huygens-Kamerlingh Onnes Laboratory, Leiden Institute of Physics, University Leiden, P.O. Box 9504, 2300 RA, Leiden, The Netherlands.

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We demonstrate tailoring supercurrent pathways in Josephson junctions using ferromagnetic vortices. This allows dynamic control and reconfiguration of supercurrent for novel superconducting spintronics devices.

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Area of Science:

  • Condensed Matter Physics
  • Superconducting Spintronics

Background:

  • Spin-triplet Cooper pairs in ferromagnets are key to superconducting spintronics.
  • Focus has been on spin-polarization for magnetization switching.
  • Magnetic textures also control supercurrent spatial distribution.

Purpose of the Study:

  • To demonstrate tailoring of supercurrent pathways in ferromagnetic Josephson junctions.
  • To utilize magnetic texture for controlling supercurrent distribution.
  • To enable dynamic reconfiguration of supercurrent for device functionality.

Main Methods:

  • Micromagnetic simulations combined with 3D supercurrent calculations.
  • Design of a disk-shaped ferromagnetic structure with a vortex.
  • Superconducting quantum interferometry for experimental validation.

Main Results:

  • Demonstrated tailoring of distinct supercurrent pathways.
  • Confirmed the existence of two transport channels induced by a ferromagnetic vortex.
  • Showed that supercurrent can be controlled by magnetic field-induced vortex motion.

Conclusions:

  • Ferromagnetic vortex structures enable control over supercurrent pathways in Josephson junctions.
  • Dynamic reconfiguration of supercurrent is achievable.
  • This approach opens new avenues for multifunctional superconducting spintronic devices.