Abstract
Time differential perturbed angular correlation spectra of111Cd in ferromagnetic polycrystalline Dy have been measured at 4.2 K in external magnetic fields up to 60 kG. The experimental data were well reproduced by a calculation which assumed that the angular distribution of the magnetic hyperfine fields is identical to that of the magnetic moments of the 4f-shells. The distribution of the 4f-moments was derived from magnetic anisotropy data. The results of this work seem to justify the application of the integral perturbed angular correlation technique for the determination of magnetic hyperfine fields in incompletely polarized ferromagnetic samples. The magnetic hyperfine fields of177Hf:Gd and177Hf:Dy have been measured by this method as:Hhf(Hf:Gd)=−375(60)kG andHhf(Hf:Dy)=−225(45)kG.
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