STATIC MAGNETIC HYPERFINE FIELDS IN MAGNETICALLY POLARIZED PD

In magnetically polarized ultrathin Pd films with (111) orientation, g rown on a Ni(001) single crystal, static magnetic hyperfine fields wer e measured at the interface using perturbed angular correlation spectr oscopy. The structural arrangement of the Pd atoms with respect to the Ni substrate differs from one Pd atom to the next, leading to varying 3d-4d electron hybridizations. This gives rise to a broad distributio n of magnetic hyperfine fields at Rh nuclei, seen in experiments with the self-element (100)pd/Rh-100, while discrete field values were foun d for the voluminous impurity probe Cd-111.