Abstract
The oxidation behavior of Co80Ni20 thin films used for magnetic recording was studied using Auger and X-ray photoelectron spectroscopy. At 500 °C and under an oxygen pressure of 1 × 10−5 Torr cobalt oxidized to CoO but nickel remained in the metallic state. The growth of CoO followed a parabolic dependence on the oxygen exposure time, suggesting diffusion-controlled kinetics for oxidation. The [Co]/[Ni] ratio at the surface increased with oxidation indicating an oxygen-induced segregation of cobalt in the alloy.
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