FERROMAGNETISM AND SPATIAL LONG-RANGE ORDER AT THE SURFACE OF BINARY ALLOYS.
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A theory of the surface concentration, spatial long-range order and magnetism for binary body-centered-cubic ordering alloys with ferromagnetic components is presented. It is a mean field theory based on a model consisting of pairwise interactions between nearest neighbors only. The authors find that for an alloy A//xB//1// minus //x with spin S//A, S//B and Ising exchange integrals J//A//A, J//B//B and J//A//B (defined positive for ferromagnetic coupling), magnetism favors surface segregation of the I components if S//I**2J//I// prime //I// prime '(I,I prime equals A,B). Results are presented for the case T//o (spatial order-disorder critical temperature) less than T//M (Curie temperature). The FeCo system is studied along these lines and the results are compared with existing experimental data.
