Nuclear orientation of54Mn nuclei in iron, cobalt and nickel

Abstract

Nuclei of the isotope 54Mn have been aligned in iron, cobalt and nickel hosts at temperatures between 0 011 and 0.03 °K. From measurements of the γ-radiation anisotropy, values for the hyperfine magnetic fields acting on manganese nuclei in dilute FeMn, CoMn, and NiMn alloys were obtained. It was shown that the hyperfine field on manganese nuclei in nickel is negative. A discussion of the effects of incomplete solution of the active nuclei in the hosts and of incomplete sample magnetization upon the deduced field values in nuclear orientation experiments is given. The hyperfine field values obtained are compared with those from nuclear magnetic resonance experiments. It is shown that the hyperfine fields on the nuclei of copper, nickel and cobalt atoms in dilute alloys of iron, cobalt and nickel vary systematically with the host and localized magnetic moments whereas there is no such simple behaviour for the fields on iron and manganese nuclei.