Abstract
We have studied the nuclear spin-lattice relaxation of Co nuclei in the Co concentration range from 1.6 ppm to 1%, using alloys containing radioactive60Co and a nuclear orientation-fast pulsed heating (NO-FH) method. In the ferromagnetic region, relatively fast relaxation is found, in agreement with an estimate based on NMR results. The observed concentration dependence of the relaxation rate is similar to that of FePd alloys. In the spin-glass regime, a moderate field dependence of the relaxation rates is seen, obeying a concentration-scaling law. At still lower concentrations, a transition to local-moment behavior is observed.
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