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Electrodynamics of Josephson junctions containing strong ferromagnets

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journal contribution
posted on 08.11.2018, 09:42 authored by D. Massarotti, Niladri BanerjeeNiladri Banerjee, R. Caruso, G. Rotoli, M.G. Blamire, F. Tafuri
Triplet supercurrents in multilayer ferromagnetic Josephson junctions with misaligned magnetization survive longer barrier thicknesses when compared with singlet supercurrents. The distinctive feature of triplet supercurrents is the scaling of the characteristic voltage of the junction with increasing ferromagnetic barrier thickness - an algebraic decay in contrast to an exponential decay for singlet supercurrents. Although the static properties of these junctions have been extensively studied, the dynamic characteristics remain largely unexplored. Here we report a comprehensive electrodynamic characterization of multilayer ferromagnetic Josephson junctions composed of Co and Ho. By measuring the temperature-dependent current-voltage characteristics and the switching current distributions down to 0.3 K, we show that phase dynamics of junctions with triplet supercurrents exhibits long (in terms of proximity) junction behavior and moderately damped dynamics with renormalized capacitance and resistance. This unconventional behavior possibly provides a different way to dynamically detect triplets. Our results show that new theoretical models are required to fully understand the phase dynamics of triplet Josephson junctions for applications in superconducting spintronics.

Funding

D.M., R.C., and F.T. thank the NANOCOHYBRI project (Cost Action CA No. 16218). N.B. acknowledges funding from the British Council through UKIERI programme and Loughborough University. M.G.B. acknowledges funding from EPSRC Programme Grant No. EP/N017242/1.

History

School

  • Science

Department

  • Physics

Published in

Physical Review B

Volume

94

Issue

14

Citation

MASSAROTTI, D. ... et al,2018. Electrodynamics of Josephson junctions containing strong ferromagnets. Physical Review B, 94 (14), 144516.

Publisher

© American Physical Society

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2018-10-22

Notes

This paper was published in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/PhysRevB.98.144516.

ISSN

2469-9950

eISSN

2469-9969

Language

en

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