Abstract
A spin-reorientation transition upon a variation of the Fe concentration $x$ is observed in ultrathin fcc ${\mathrm{Fe}}_{x}{\mathrm{Co}}_{1\ensuremath{-}x}$ alloy films on Cu(001) for $x$g77%. For film thicknesses below 4 monolayers the magnetic easy axis changes from in-plane on the Co-rich side to out-of-plane on the Fe-rich side. Since no structural transitions accompany this spin-reorientation transition, varying the alloy composition can be interpreted as varying the number of $3d$ electrons. Upon changing the average $d$-band filling by as little as 0.1 electron strong changes of the anisotropy energy are observed.
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