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 unconventi

SUBMITTER: Massarotti D 

PROVIDER: S-EPMC4468849 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature