Abstract
Granular Fe-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ thin films, composed of small iron particles dispersed in an amorphous alumina matrix, have been analyzed as a function of the composition and of the depth by x-ray photoemission spectroscopy. The surface of all the samples is composed of a fully oxidized ${\mathrm{Fe}}^{3+}$ form within an alumina-rich partly hydrated region, and the surface quantitative composition is highly dependent on the bulk composition. After ${\mathrm{Ar}}^{+}$ etching, metallic iron and iron aluminates become apparent. The concentration of the first species increases with increasing depth and the iron content in the bulk of the granular films.
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