Co1−xPtx alloys with Pt contents in the range 0.45≤x≤0.9 show sizable perpendicular magnetic anisotropy, 100% perpendicular remanence and coercivities in the range 160 kA/m. Thin films of this material are grown by electron beam evaporation onto fused silica or Si, at substrate temperatures between 150 and 350 °C. Spectroscopic investigations of the polar Kerr rotation show a significant enhancement of the Pt related UV peak. A comparison of the static signal levels R×(θk2+εk2)1/2 of Co/Pt multilayers and alloys shows an overall 50% enhancement in the case of alloys. Curie temperatures around 200 °C are observed for Co∼22Pt∼78 compositions. These properties, together with the potentially high chemical stability and ease of manufacturing make Co1−xPtx alloys very attractive materials for short wavelength magneto-optic recording.

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An x-ray diffraction study has been carried out to study vertical lattice strain in polycrystalline HV evaporated Co-Pt and Co-Pd alloys and UHV evaporated Co-Pt alloys on SiN buffered fused silica substrates. The data support an inhomogeneity model, which was proposed to explain the occurence of perpendicular magnetic anisotropy in these alloys. The effect of subatomic layering on magneto-optic properties in 100nm thick HV evaporated C0 2S Pt 72 is reported.