Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions

D. Massarotti (), A. Pal, G. Rotoli, L. Longobardi, M. G. Blamire and F. Tafuri ()
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D. Massarotti: Università degli Studi di Napoli ‘Federico II’, Monte S.Angelo
A. Pal: University of Cambridge
G. Rotoli: Seconda Università degli Studi di Napoli
L. Longobardi: Seconda Università degli Studi di Napoli
M. G. Blamire: University of Cambridge
F. Tafuri: CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8376

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