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Nature Research, Nature Communications, 1(6), 2015

DOI: 10.1038/ncomms8376

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Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions

Journal article published in 2015 by D. Massarotti ORCID, A. Pal, G. Rotoli, L. Longobardi ORCID, M. G. Blamire, F. Tafuri
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 tunneling in Josephson junctions with GdN ferromagnetic insulator barriers. We prove a clear transition from thermal to quantum regime at a crossover temperature of about 100 mK at zero magnetic field in junctions which demonstrate a clear signature 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. ; Comment: 16 pages, 4 figures