The Internal Hyperfine Magnetic Fields on Arsenic in Cobalt and Nickel Hosts

Abstract

The hyperfine internal magnetic fields on arsenic nuclei in cobalt and nickel hosts have been measured by the integral reversed field method of perturbed angular correlation technique. The 5⁺/2 (121.1 keV) 5⁻/2 (279.6 keV) 3⁻/2 cascade in ⁷⁵As was used for the directional correlation and rotation measurements. Using g=0.36±0.04 and τ=(4.67±0.43)×10⁻¹⁰ sec for the 279.6 keV level of ⁷⁵As, the hyperfine fields on arsenic in cobalt and nickel at room temperature have been found to be
H_Co^As=+252±45 kOe,
H_Ni^As=+121±20 kOe,
respectively. The hyperfine fields on arsenic in iron, cobalt and nickel hosts seem to be predominantly proportional to the effective host moments.