Evidence for a high-spin Fe phase in Fe/Pd(001) multilayers

We have investigated by X-ray Magnetic Circular Dichroism (XMCD) the Fe spi n and orbital magnetic moments in Fe/Pd(001) multilayers with nominal Fe th icknesses up to 3 Atomic Layers (AL). We find a strong enhancement of both spin and orbital moments (m(spin) approximate to 2.8 mu(B) and m(orb) appro ximate to 0.3 mu(B)) compared to bulk Fe in excellent agreement with theore tical calculations. For 1 AL of Fe, the magnetic dipole term was deduced us ing the Stohr and Kong method and found to be non-negligible (20% of m(spin )). We further show that, for 3 AL of Fe, the high spin phase is correlated to a fcc-like crystalline structure with a large atomic volume of Fe (appr oximate to 12.4 Angstrom(3)).