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Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions

Author

Listed:
  • D. Massarotti

    (Università degli Studi di Napoli ‘Federico II’, Monte S.Angelo
    CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia)

  • A. Pal

    (University of Cambridge)

  • G. Rotoli

    (Seconda Università degli Studi di Napoli)

  • L. Longobardi

    (Seconda Università degli Studi di Napoli
    American Physical Society)

  • M. G. Blamire

    (University of Cambridge)

  • F. Tafuri

    (CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia
    Seconda Università degli Studi di Napoli)

Abstract

The interfacial coupling of two materials with different ordered phases, such as a superconductor (S) and a ferromagnet (F), is driving new fundamental physics and innovative applications. For example, the creation of spin-filter Josephson junctions and the demonstration of triplet supercurrents have suggested the potential of a dissipationless version of spintronics based on unconventional superconductivity. Here we demonstrate evidence for active quantum applications of S-F-S junctions, through the observation of macroscopic quantum tunnelling in Josephson junctions with GdN ferromagnetic insulator barriers. We show a clear transition from thermal to quantum regime at a crossover temperature of about 100 mK at zero magnetic field in junctions, which present clear signatures of unconventional superconductivity. Following previous demonstration of passive S-F-S phase shifters in a phase qubit, our result paves the way to the active use of spin filter Josephson systems in quantum hybrid circuits.

Suggested Citation

  • D. Massarotti & A. Pal & G. Rotoli & L. Longobardi & M. G. Blamire & F. Tafuri, 2015. "Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8376
    DOI: 10.1038/ncomms8376
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