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Based on a total energy search among the complete set of 2^n-1 collinear spin states for n (n0ex{0ex}=0ex{0ex}1, , 6) monolayers (ML) of fcc Fe on Cu (100) by use of the generalized gradient approximation combined with the full-potential linearized augmented plane-wave method, we find ferromagnetism for 1, 2, and 3 ML fcc-Fe/Cu (100), bilayer antiferromagnetism for even numbers of layers (4 and 6 ML), and the coexistence of several spin states for an odd number of layers (5 ML). The results are consistent with the experimental situation and a possible spin-spiral ground state of fcc Fe. Effects of band narrowing, relaxations, interface mixing, and surface steps are addressed.
Asada et al. (Mon,) studied this question.