  We study the proximity effect in superconductor - metallic or ferromagnetic
Aharonov Bohm loop hybrid structures self consistently using the
Bogoliubov-deGennes formalism within the two dimensional extended Hubbard
model. We calculate the local density of states, the pair amplitude, and
persistent currents as a function of several modulation parameters, the
position around the loop, the exchange field, the magnetic flux through the
loop, the loop size, and the chemical potential in the loop atoms. We find that
the parameters above can modulate the proximity effect.
