  We demonstrate, both theoretically and experimentally, that thin dirty
superconductor-normal metal bilayer with resistivity of normal metal $\rho_N$
much smaller than normal-state resistivity of superconductor $\rho_S$ has
unique superconducting properties. First of all the normal layer provides the
dominant contribution to the diamagnetic response of whole bilayer structure in
wide temperature interval below the critical temperature due to proximity
induced superconductivity. Secondly, the presence of the normal layer may
increase the critical current $I_c$ in several times (the effect is not
connected with enhanced vortex pinning), provides strong temperature dependence
of both $I_c$ and effective magnetic field penetration depth even at
temperatures much below the critical one and leads to the diode effect in
parallel magnetic field. Besides of general interest we believe that the found
results may be useful in construction of different kinds of superconducting
detectors.
