Interplay of atomic order and ferromagnetism at the surface of binary alloys
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Ferromagnetism and spatial long range order at the surface of binary alloys are studied within the mean field approximation. We find that for an alloy AxB1-x with spins SA, SB and Ising exchange integrals JAA, JBB and JAB, magnetism favors surface segregation of the A component if S2AJAA < S2BJBB. Results for the surface concentration at T = 0 are presented. The FexCo1-x system is examined along these lines and the results are compared with existing experimental data. © 1981.
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