Supercurrent decay in ballistic magnetic Josephson junctions

Herve Ness, Mark Van Schilfgaarde, Ivan Sadovskyy, Andrey Antipov, Roman Lutchyn

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We investigate transport properties of ballistic magnetic Josephson junctions and establish that suppression of supercurrent is an intrinsic property of the junctions, even in absence of disorder. By studying the role of ferromagnet thickness, magnetization, and crystal orientation we show how the supercurrent decays exponentially with thickness and identify two mechanisms responsible for the effect: (i) large exchange splitting may gap out minority or majority carriers leading to the suppression of Andreev reflection in the junction, (ii) loss of synchronization between different modes due to the significant dispersion of the quasiparticle velocity with the transverse momentum. Our results for Nb/Ni/Nb junctions are in good agreement with recent experimental studies. Our approach combines density functional theory and the Bogoliubov-de Gennes model and opens a path for material composition optimization in magnetic Josephson junctions and superconducting magnetic spin valves.
Original languageEnglish
Article number23
Number of pages11
Journalnpj Computational Materials
Issue number1
Early online date28 Jan 2022
Publication statusPublished - 28 Jan 2022


  • Magnetic Josephson junction
  • pi-junction
  • JM RAM
  • ab initio calculations
  • scattering theory


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