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We present x-ray resonant magnetic reflectivity (XRMR) as a very sensitivetool to detect proximity induced interface spin polarization in Pt/Fe,Pt/Ni$_{33}$Fe$_{67}$, Pt/Ni$_{81}$Fe$_{19}$ (permalloy), and Pt/Ni bilayers.We demonstrate that a detailed analysis of the reflected x-ray intensity givesinsight in the spatial distribution of the spin polarization of a non-magneticmetal across the interface to a ferromagnetic layer. The evaluation of theexperimental results with simulations based on optical data from ab initiocalculations provides the induced magnetic moment per Pt atom in the spinpolarized volume adjacent to the ferromagnet. We find the largest spinpolarization in Pt/Fe and a much smaller magnetic proximity effect in Pt/Ni.Additional XRMR experiments with varying photon energy are in good agreementwith the theoretical predictions for the energy dependence of the magnetoopticparameters and allow identifying the optical dispersion $\delta$ and absorption$\beta$ across the Pt L3-absorption edge.

Static magnetic proximity effect in Pt/Ni$_{1-x}$Fe$_x$ bilayers investigated by x-ray resonant magnetic reflectivity