A semi-infinite ferromagnetic simple cubic Ising lattice which has nonmagnetic impurities substituted for the magnetic species only at the surface is investigated with the use of a new type of effective-field theory with correlation. The surface magnetism is examined as a function of modified exchange J, = J(1+6) and concentration P of magnetic atoms at the surface. The critical value 5" transition temperatures T"and phase diagram for surface ordering are obtained as functions of P and A. The reduced magnetization curves of surface and bulk are also studied. We obtain some characteristic behaviors of magnetism at the diluted surface.

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