We performed polarized neutron reflectometry (PNR) experiments on a 29?nm thick Au93Fe7 film in a temperature range from 295?K down to 2?K in a vertical magnetic field up to 6?T. These high-field experiments were performed on the C5 spectrometer in Chalk River, Canada, using a split-pair cryomagnet. The magnetization as determined by PNR can be described with a Brillouin function from 295?K down to 50?K assuming the magnetic moment of isolated Fe atoms, i.e. 4[mu]B per Fe atom. Below 50?K the onset of the spin-glass freezing is observed as a strong deviation from this Brillouin type behavior of isolated atoms. ; system details: machine converted author identifier PE to PID, February 2012