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We present a systematic study of the magnetic proximity effect in Pt,depending on the magnetic moment and anisotropy of adjacent metallicferromagnets. Element-selective x-ray resonant magnetic reflectivitymeasurements at the Pt absorption edge (11565$\,$eV) are carried out toinvestigate the spin polarization of Pt in Pt/Co$_\textrm{1-x}$Fe$_\textrm{x}$bilayers. We observe the largest magnetic moment of (0.72$\,\pm\,$0.03)$\,\mu_\textrm{B}$ per spin polarized Pt atom inPt/Co$_\textrm{33}$Fe$_\textrm{67}$, following the Slater-Pauling curve ofmagnetic moments in Co-Fe alloys. In general, a clear linear dependence isobserved between the Pt moment and the moment of the adjacent ferromagnet.Further, we study the magnetic anisotropy of the magnetized Pt which clearlyadopts the magnetic anisotropy of the ferromagnet below. This is depicted forPt on Fe(001) and on Co$_\textrm{50}$Fe$_\textrm{50}$(001), which have a45$^{\circ}$ relative rotation of the fourfold magnetocrystalline anisotropy.

Impact of magnetic moment and anisotropy of Co$_\textrm{1-x}$Fe$_\textrm{x}$ thin films on the magnetic proximity effect of Pt