X-RAY RESONANT EXCHANGE SCATTERING FROM 3D TRANSITION-METAL SURFACES

The decay of the elastic X-ray intensity peak versus perpendicular tra nsferred momentum is theoretically studied at energies close to the LI I edge, for single crystal Fe surfaces and thin Fe films. For the sing le crystal surface, large intensity changes are observed upon reversal of the direction of the magnetisation. For thin Fe films, which are k nown to exhibit perpendicular magnetisation, analogous effects are pre dicted when, by raising the temperature, the magnetisation becomes in- plane. These changes are sensitive to both direction and magnitude of the surface magnetic moments, making this technique a powerful probe f or studying the magnetic properties of 3d surfaces and interfaces.