The magnetic hyperfine field of interstitial Cd in a cubic vacancy complex in fcc cobalt

The value, sign and temperature dependence of the magnetic hyperfine field B_hf have been determined by time differential perturbed angular correlation measurements for ¹¹¹Cd impurities in a cubic vacancy defect in ferromagnetic fcc cobalt. The defect is formed by ion implantation of radioactive ¹¹¹In ions. Comparison to analogous experimental results on B_hf for Cd and Sn impurities in fcc cobalt and nickel reveals distinct systematic trends in both value and sign of B_hf. These are discussed in the light of results from functional-density theories.