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The spin polarization of Pt in Pt/NiFe2O4 and Pt/Fe bilayers is studied byinterface-sensitive x-ray resonant magnetic reflectivity to investigate staticmagnetic proximity effects. The asymmetry ratio of the reflectivity wasmeasured at the Pt L3 absorption edge using circular polarized x-rays foropposite directions of the magnetization at room temperature. The results ofthe 2% asymmetry ratio for Pt/Fe bilayers are independent of the Pt thicknessbetween 1.8 and 20 nm. By comparison with ab initio calculations, the maximummagnetic moment per spin polarized Pt atom at the interface is determined to be$(0.6\pm0.1)\,\mu_{B}$ for Pt/Fe. For Pt/NiFe2O4 the asymmetry ratio dropsbelow the sensitivity limit of $0.02\,\mu_{B}$ per Pt atom. Therefore, weconclude, that the longitudinal spin Seebeck effect recently observed inPt/NiFe2O4 is not influenced by a proximity induced anomalous Nernst effect.

Static magnetic proximity effect in Pt/NiFe2O4 and Pt/Fe bilayers investigated by x-ray resonant magnetic reflectivity