  We examine the effect of the magnetic field on the proximity effect in
nanostructures, self consistently using the Bogoliubov-deGennes formalism
within the two dimensional extended Hubbard model. We calculate the local
density of states and the pair amplitude. We study several nanostructures:
superconductor - two dimensional electron gas, superconductor - ferromagnet. In
these structures the magnetic field can be considered as a modulation parameter
for the proximity effect.
