Pt magnetization profile in a Pt/Co bilayer studied by resonant magnetic x-ray reflectometry

The Pt magnetization depth profile at a single buried Pt/Co interface was investigated by x-ray resonant magnetic reflectivity measurements. The asymmetry as function of angle of incidence has been measured in the Pt $L_3$-near-edge absorption region at two energies. Observed asymmetry ratios in the order of 0.5% are described on the basis of a magnetically modified Parratt algorithm. Excellent agreement between simulations and experiment was achieved for a Pt magnetic moment of $0.21{\mu }_B$ at the rough interface followed by an exponential decay of the induced polarization within 1 nm.