X-ray resonant scattering in the ferromagnet CoPt.

Resonant enhancement of the magnetic x-ray scattering has been observed in the ferromagnetic compound CoPt. By measuring the scattered Bragg intensities upon reversal of the magnetization perpendicular to the scattering plane, the asymmetry ratio has been determined for the (220), (331), and the (440) reflections. The resonant line shape of the asymmetry ratios was investigated by tuning the photon energy through the L III edge of platinum. Values, as large as -0.012, -0.07, and 0.09 for the (220), (331), and (440) reflections, respectively, are observed at the maximum of the resonance