Deviation of the impurity magnetic hyperfine fields at Br and Kr from the host lattice magnetization in Ni

The magnetic hyperfine fields at Br and Kt nuclei in nickel have been measured by heavy ion implantation techniques. Extrapolating to O K, H = -0.7(1) T is obtained for Kr and H = +8.0(1) T for Br, in qualitative agreement with theoretical values, The temperature dependences deviate strongly from that of the lattice magnetization.