Friday, July 19, 2013

1307.4878 (L. Ruiz-Valdepeñas et al.)

Double percolation effects and fractal behavior in
magnetic/superconducting hybrids

L. Ruiz-Valdepeñas, M. Velez, F. Valdes-Bango, L. M. Alvarez-Prado, J. I. Martin, E. Navarro, J. M. Alameda, J. L. Vicent
Perpendicular magnetic anisotropy ferromagnetic/ superconducting (FM/SC) bilayers with a labyrinth domain structure are used to study nucleation of superconductivity on a fractal network, tunable through magnetic history. As clusters of reversed domains appear in the FM layer, the SC film shows a percolative behavior that depends on two independent processes: the arrangement of initial reversed domains and the fractal geometry of expanding clusters. For a full labyrinth structure, the behavior of the upper critical field is typical of confined superconductivity on a fractal network.
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