Abstract
We studied the influence of surface segregation and finite size effects on a phase diagram of a thin film. The tight binding Ising model within a mean field approximation was applied to the popular FeCu system. Cu surface segregation leads to a pre-phase separation at the surface and then reduces the stability range of the solid solution on the Fe-rich side of the phase diagram. At the opposite side, the free energy cost of the interphase boundaries leads to an increase of the domain of the solid solution on the Cu-rich side.
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