Non-Fraunhofer Interference Pattern in Inhomogeneous Ferromagnetic Josephson Junctions

Details Non-Fraunhofer Interference Pattern in Inhomogeneous Ferromagnetic Josephson Junctions Non-Fraunhofer Interference Pattern in Inhomogeneous Ferromagnetic Josephson Junctions

2011-11-30

arxiv.org/abs/1112.0007v1

Phys. Rev. Lett. 108, 037001 (2012)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures. To Appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.108.037001

Generic conditions are established for producing a non-Fraunhofer response of the critical supercurrent subject to an external magnetic field in ferromagnetic Josephson junctions. Employing the quasiclassical Keldysh-Usadel method, we demonstrate theoretically that an inhomogeneity in the magnitude of the energy scales in the system, including Thouless energy, exchange field and temperature gradient normal to the transport direction, influences drastically the standard Fraunhofer pattern. The exotic non-Fraunhofer response, similar to that observed in recent experiments, is described in terms of an intricate interplay between multiple '0-pi'-states and is related to the appearance of proximity vortices.

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