  We study the effect of image potential on spin polarized transport through
Fe/MgO/Fe magnetic tunnel junctions in the presence of symmetry filtering. The
image potential is included within the Simmon's model coupled with the
non-equilibrium Green's function formalism to calculate the quantum transport.
The increase in the current densities for the $\Delta_1$ symmetry and the
$\Delta_5$ symmetry bands due to the image potential is more pronounced at
higher bias, whereas, the increase in the magnitude of the tunnel
magnetoresistance ratio is more prominent at lower bias for various barrier
thicknesses.
