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The diode effect induced by domain-wall superconductivity.

M A Silaev1, A Yu Aladyshkin, M V Silaeva

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|February 15, 2014
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Summary
This summary is machine-generated.

Superconductor/ferromagnet hybrids exhibit a diode effect in their domain-wall superconducting channels. This critical current behavior depends on current direction relative to the local magnetization, enabling asymmetric transport in these advanced materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Flux-coupled superconductor/ferromagnet (S/F) hybrids host unique superconducting states.
  • Domain walls in ferromagnetic materials create spatially varying magnetic fields.

Purpose of the Study:

  • To calculate the critical current of domain-wall superconducting channels in S/F hybrids.
  • To investigate the influence of nonuniform magnetic fields from domain walls on superconducting transport.
  • To explore the potential for a diode effect in these systems.

Main Methods:

  • Utilizing the phenomenological Ginzburg-Landau model.
  • Analyzing the critical current in the presence of domain-wall magnetic fields.
  • Investigating current-direction-dependent transport properties.

Main Results:

  • The critical current in S/F hybrids is asymmetric with respect to the current direction.
  • This asymmetry is linked to the parity-breaking vector (proportional to V x M) and local magnetization M(r).
  • The diode effect is demonstrated for both infinite and mesoscopic S/F structures.

Conclusions:

  • S/F hybrids with domain-wall superconducting channels can exhibit a diode effect.
  • The directionality of current flow is controllable by the magnetization vector.
  • These findings open possibilities for novel superconducting electronic devices.