Details

Autor(en) / Beteiligte

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

Titel

Macroscopic quantum tunnelling in spin filter ferromagnetic Josephson junctions

Ist Teil von

• Nature communications, 2015-06, Vol.6 (1), p.7376-7376, Article 7376

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.