  The effect of a localized drive on the steady state of an interface
separating two phases in coexistence is studied. This is done using a spin
conserving kinetic Ising model on a two dimensional lattice with cylindrical
boundary conditions, where a drive is applied along a single ring on which the
interface separating the two phases is centered. The drive is found to induce
an interface spontaneous symmetry breaking whereby the magnetization of the
driven ring becomes non-zero. The width of the interface becomes finite and its
fluctuations around the driven ring are non-symmetric. The dynamical origin of
these properties is analyzed in an adiabatic limit which allows the evaluation
of the large deviation function of the driven-ring magnetization.
