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 B at the rough interface followed by an exponential decay of the induced polarization within 1 nm.

X-ray magnetic circular dichroism measurements in the hard and soft x-ray region have been performed at Mn K and L2,3 edges of the ruthenium (with x=0.05, 0.1 and 0.5) doped Ruddlesden–Popper-phase La1.2Sr1.8Mn2−xRuxO7. In combination with magnetometry, clear evidence of unexpected antiferromagnetic sublattice coupling between manganese and ruthenium was found. A simple coupling model of Mn+3/Mn+4 and Ru+3/Ru+4 ions in the high-spin state is proposed which explains the antiparallel alignment and the technological interesting increase of the Curie temperature.

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