  Quantum tunneling of an electron through a classically forbidden regime has
no classical analogue and several aspects of it are still not well understood.
In this work we analyze electronic currents under the barrier. For this we
consider a multichannel Aharonov-Bohm ring and developed a correct formalism to
calculate the currents inside the ring when the states are evanescent. We also
show unlike other proposed quantum devices that such currents and associated
conductance are not very sensitive to changes in material parameters and thus
the system can be used to build stable devices that work on magnetic and
transport properties. We also study the current magnification property of the
ring in presence of both propagating and evanescent states.
