Abstract
The ion-implantation perturbed angular correlation technique (IMPAC) was applied to the study of properties of Gd as stopping material. The transient magnetic fields at Fe, Ge, Mo, Ru, Pd, Cd and Te nuclei implanted into ferromagnetic Gd at 80 K were measured. The static magnetic hyperfine fields for Ru and Pd were deduced to be + 65 ? 25 kG and -45 ? 23 kG, respectively. The Z1-dependence could be fitted by the adjusted Lindhard-Winther theory except for the case of implanted Fe-nuclei. The deviating behaviour for the 56Fe isotope was investigated in a separate experiment, where the dependence of the transient field was found to be directly proportional to the velocity of the recoiling ion. This result is in contradiction to the Lindhard-Winther model.
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