Abstract
We have measured the temperature dependence of magnetic hyperfine field for 66Ga and 71As in ferromagnetic rare earth hosts Gd and Tb using TDPAD method. High spin isomeric states: 7 − in 66Ga and 9/2 + in 71As, excited by the nuclear reactions 12C(56Fe, pn)66Ga and 12C(63Cu, 2p2n)71As were used as nuclear probes for magnetic hyperfine interaction studies. The saturation the hyperfine fields, Bhf(0) for 66Ga in Gd and Tb have been determined as: 11.4 kG in Gd and 3.5 kG respectively. The Bhf(0) values for 71As have been found to be 45 kG in Gd and 14.1 kG in Tb. The measured hyperfine field values for 66Ga and 71As, scaled by the 5d moments of the rare earth hosts, follow the systematic trend observed in 3d ferromagnets viz. Fe, Co and Ni.
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