Effective Magnetic Fields on Samarium-150 in Ferromagnetic Lattices

Abstract

The ion-implanation perturbed-angular-correlation technique has been used to determine the hyperfine magnetic fields on samarium-150 nuclei in ferromagnetic iron, cobalt, nickel, and gadolinium lattices. Assuming the published value of 1400 kG for the field on samarium in iron, it follows that the hyperfine fields on samarium in cobalt and nickel, at 300\ifmmode^\circ\else\textdegree\fi{}K, are 1119\ifmmode\pm\else\textpm\fi{}64 and 352\ifmmode\pm\else\textpm\fi{}13 kG, respectively; and in gadolinium at 110\ifmmode^\circ\else\textdegree\fi{}K, -295\ifmmode\pm\else\textpm\fi{}30 kG. The hyperfine fields in iron, cobalt, and nickel are proportional to the atomic monents of the respective hosts. The major contribution to the field on samarium in gadolinium can be accounted for by polarized conduction-electron exchange. The gyromagnetic ratio for the 334-keV ${2}^{+}$ level in ${\mathrm{Sm}}^{150}$ is determined to be 0.47\ifmmode\pm\else\textpm\fi{}0.06.