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We report a surprising observation that the growth of the Fe1 ML=Co1 ML n superlattice of L1 0 structure on Cu(100) is stable only up to six atomic layers (n 3), which cannot be rationalized by stress arguments. Instead, first-principles calculations reveal a transition from the L1 0 to the B2 structure due to the effect of dimensionality on the stability of the electronic structure of the superlattice. Whereas the majority-spin electrons are energetically insensitive to the layer thickness,doi:10.1103/physrevlett.91.226106 pmid:14683255 fatcat:r5ine46o5nfzve6fbwyx7wvd7e