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Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions.


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.

SUBMITTER: Massarotti D 

PROVIDER: S-EPMC4468849 | biostudies-other | 2015

REPOSITORIES: biostudies-other

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Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions.

Massarotti D D   Massarotti D D   Pal A A   Rotoli G G   Longobardi L L   Blamire M G MG   Tafuri F F  

Nature communications 20150609


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, throug  ...[more]

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