Proximity effect in superconductor/conical magnet/ferromagnet heterostructures

Daniel Fritsch, James F Annett

Research output: Contribution to specialist publicationArticle (Specialist Publication)

15 Citations (Scopus)
55 Downloads (Pure)

Abstract

At the interface between a superconductor and a ferromagnetic metal spin-singlet Cooper pairs can penetrate into the ferromagnetic part of the heterostructure with an oscillating and decaying spin-singlet Cooper pair density. However, if the interface allows for a spin-mixing effect, equal-spin spin-triplet Cooper pairs can be generated that can penetrate much further into the ferromagnetic part of the heterostructure, known as the long-range proximity effect. Here, we present results of spin-mixing based on self-consistent solutions of the microscopic Bogoliubov-de Gennes equations in the clean limit incorporating a tight-binding model. In particular, we include a conical magnet into our model heterostructure to generate the spin-triplet Cooper pairs and analyse the influence of conical and ferromagnetic layer thickness on the unequal-spin and equal-spin spin-triplet pairing correlations. It will be shown that, in agreement with experimental observations, a minimum thickness of the conical magnet is necessary to generate a sufficient amount of equal-spin spin-triplet Cooper pairs allowing for the long-range proximity effect.
Original languageEnglish
Number of pages14
Volume16
No.055005
Specialist publicationNew Journal Physics
DOIs
Publication statusPublished - 6 May 2014

Keywords

  • SUPERCONDUCTOR
  • superconducting junctions
  • FERROMAGNET/SUPERCONDUCTOR LAYERED STRUCTURES

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    Spin supercurrents

    Annett, J. F.

    1/04/121/04/15

    Project: Research

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