Abstract
Influence of oxygen adsorption on the perpendicular anisotropy in vacuum deposited amorphous Gd–Fe and Gd–Co films was studied. The films of typically 500 Å thickness were prepared by co-evaporation technique. As for Gd–Fe, the perpendicular anisotropy of 3×105 erg/cm3 was found in oxygen-free films but the perpendicular magnetization was not found in oxygen-adsorbed films. This difference is not only due to the increase of the magnetization resulting from the oxidation of the surface layer, but also due to the decrease of the anisotropy by the adsorption of oxygen. It was further found that Gd–Fe films of only 100 Å thickness exhibit the perpendicular magnetization if the films are not exposed to the atmosphere. For Gd–Co films, the magnetization was in-plane in as-deposited samples, but slight increase of the anisotropy was found in the sample containing oxygen during annealing at 200–300 C.
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