The intrinsic perpendicular magnetic anisotropy constant K/sub u/ of (Co/sub 100-x/Fe/sub x/)/sub 50/Pt/sub 50/(0/spl les//spl times//spl les/100) alloy thin films is determined at room temperature. It is found to increase with order parameter S, and decrease with the tetragonality c/a for all compositions. The estimated K/sub u/ values obtained by the extrapolation to S=1 are nearly identical for x from 0 to 56, but increase for x beyond 56. The polar Kerr rotation is found to become more enhanced for photon energies near 1.4/spl sim/3.5 eV and 4/spl sim/6.8 eV with increasing x. Observations of domain structures in Fe/sub 50/Pt/sub 50/ thin films reveal an induced in-plane magnetic anisotropy when the thickness exceeds 1000 /spl Aring/.
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Kanazawa et al. (2001) studied this question.
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