Supercurrent decay in ballistic magnetic Josephson junctions

Ness, Hervé; Sadovskyy, Ivan A.; Antipov, Andrey E.; van Schilfgaarde, Mark; Lutchyn, Roman M.

doi:10.1038/s41524-021-00694-3

Supercurrent decay in ballistic magnetic Josephson junctions

Journal Article · Fri Jan 28 00:00:00 EST 2022 · npj Computational Materials

DOI:https://doi.org/10.1038/s41524-021-00694-3· OSTI ID:1846935

Ness, Hervé ^[1]; ^[2]; Antipov, Andrey E. ^[2]; van Schilfgaarde, Mark ^[3]; Lutchyn, Roman M. ^[2]

King's College, London (United Kingdom)
Univ. of California, Santa Barbara, CA (United States)
King's College, London (United Kingdom); National Renewable Energy Lab. (NREL), Golden, CO (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1846935

Report Number(s):: NREL/JA-5F00-82233; MainId:83006; UUID:305c8d95-b291-4968-985c-f766cc9a2d47; MainAdminID:63907

Journal Information:: npj Computational Materials, Journal Name: npj Computational Materials Journal Issue: 1 Vol. 8; ISSN 2057-3960

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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