The intrinsic perpendicular magnetic anisotropy constant K/sub u/ for (Fe-Co-Ni)/sub 50/Pt/sub 50/ quaternary alloy and (Fe-Cr)/sub 50/Pt/sub 50/ alloy thin films is discussed as a function of structure and composition. Both M/sub s/ and the estimated K/sub u/ values obtained by the extrapolation to order parameter S = 1 using the dependence of K/sub u/ on S become maximum at the valence electron number n/sub elect/ = 8, being independent of alloy system. The magnetic anisotropy is determined to the first approximation by the Fermi energy, which changes with the number of electrons, but not by the band structure itself.
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Suzuki et al. (2002) studied this question.
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