Abstract
In this paper the magnetic properties of Mn ultrathin films grown on (001) Fe are shown to depend on the oxygen contamination. For very small amounts of oxygen, the Mn absorption spectra clearly indicate the metallic character of the bonding between Mn atoms, and the Mn/Fe coupling is ferromagnetic. In oxidized Mn films, localization of the $3d$ electrons due to Mn-O bonding is observed and the Mn/Fe coupling is antiferromagnetic. The Mn dichroic signal is explained quantitatively as soon as the amount of oxygen in the Mn layer is known, leading to a Mn atomic moment of $3{\ensuremath{\mu}}_{B}$ in unoxidized films.
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