MEASURED STATIC HYPERFINE MAGNETIC-FIELDS FOLLOWING IMPLANTATION OF PT INTO FE INTERPRETED AS EVIDENCE FOR PREEQUILIBRIUM EFFECTS

The static hyperfine magnetic field present at Pt nuclei implanted in ferromagnetic Fe has been measured using the ion-implantation perturbe d angular correlation (IMPAC) technique following Coulomb excitation. The present measured precessions agree with earlier data, but more rec ent information on the transient field correction leads to an inferred static field strength that is similar to 25% smaller than obtained pr eviously. Comparisons are made between the static fields measured by v arious techniques for Pt and neighbouring ions in iron. From these com parisons, we show that the IMPAC data are consistent with a scenario i n which (i) the static field takes about 10 ps to reach its equilibriu m value, following recovery from dynamic structural damage caused by t he ion-implantation process, and (ii) following equilibration, a large fraction (similar to 90%) of the implanted ions have final positions on lattice sites of the Fe host.