Grazing-incidence X-ray magnetic scattering studies of UO2(0 0 1) surfaces

Grazing-incidence, X-ray resonant magnetic scattering measurements have been performed on a UO2(0 0 1) surface at and below the bulk Néel temperature of ∼30 K. We observe scattering associated with the (0 1 0) magnetic truncation rod. The scattering exhibits the expected resonance as a function of incident photon energy, and is observed to vanish at TN on heating. The L-dependence of the observed scattering exhibits the characteristic Vineyard profile as the angle of incidence is swept through the critical angle. Based on the refractive index, we estimate the penetration depth of the grazing-incidence measurements reported here to be approximately 50 Å.