Width of the phase transition in diffusive magnetic Josephson junctions
arXiv:0812.1476 · doi:10.1103/PhysRevB.78.214518
Abstract
We investigate the Josephson current between two superconductors (S) which are connected through a diffusive magnetic junction with a complex structure (F). Using the quantum circuit theory, we obtain the phase diagram of 0 and Josephson couplings for F being a IFI (insulator-ferromagnet-insulator) double barrier junction or a IFNFI structure (where N indicates a normal metal layer). Compared to a simple SFS structure, we find that the width of the transition, defined by the interval of exchange fields in which a transition is possible, is increased by insulating barriers at the interfaces and also by the presence of the additional N layer. The widest transition is found for symmetric F structures. The symmetric SIFNFIS presents the most favorable condition to detect the temperature induced transition with a relative width, which is five times larger than that of the corresponding simple SFS structure.
6 pages, 3 figures, accepted for publication in Phys. Rev. B
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