Tuning of Magnetic Activity in Spin-Filter Josephson Junctions Towards Spin-Triplet Transport. / Caruso, Roberta; Massarotti, D.; Campagnano, G.; Pal, A. ; Ahmad, H. G.; Lucignano, P.; Eschrig, Matthias; Blamire, Mark G.; Tafuri, F.

In: Physical Review Letters, Vol. 122, No. 4, 047002, 01.02.2019, p. 1-6.

Research output: Contribution to journalLetterpeer-review




  • Roberta Caruso
  • D. Massarotti
  • G. Campagnano
  • A. Pal
  • H. G. Ahmad
  • P. Lucignano
  • Matthias Eschrig
  • Mark G. Blamire
  • F. Tafuri


The study of superconductor/ferromagnet interfaces has generated a great interest in the last decades, leading to the observation of long-range spin triplet supercurrent and 0 − π transitions in Josephson junctions where two superconductors are separated by an itinerant ferromagnet. Recently, spin-filter Josephson junctions with ferromagnetic barriers have shown unique transport properties, when compared to standard metallic ferromagnetic junctions, due to the intrinsically non-dissipative nature of the tunneling process. Here we present the first extensive characterization of spin polarized Josephson junctions down to 0.3 K, and the first evidence of an incomplete 0−π transition in highly spin polarized tunnel ferromagnetic junctions. Experimental data are consistent with a progressive enhancement of the magnetic activity with the increase of the barrier thickness, as neatly captured by the simplest theoretical approach including a non uniform exchange field. For very long junctions, unconventional magnetic activity of the barrier points to the presence of spin-triplet correlations.
Original languageEnglish
Article number047002
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 1 Feb 2019


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