  We study the interaction between a one dimensional magnetic nanostructure and
a thin film superconductor. It is shown that different magnetic distributions
produce characteristic magnetic field signatures. Moreover, the magnetic
structure can induce a weak link in the superconducting film, or be positioned
directly above a predefined nonsuperconducting weak link. We estimate the
magnetic flux associated with such a structure, and discuss a general
expression for the energy calculated within the London model.
