Supercurrent Decay in Ballistic Magnetic Josephson Junctions: Article No. 23

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

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10 Scopus Citations

Abstract

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 languageAmerican English
Article number23
Number of pages11
Journalnpj Computational Materials
Volume8
Issue number1
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).

NREL Publication Number

  • NREL/JA-5F00-82233

Keywords

  • ballistic
  • decay
  • Josephson junctions
  • supercurrent

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