Abstract
Low-temperature nuclear orientation has been applied to the study of the nuclear spin-lattice relaxation (SLR) of60Co in the Co phase of a single-crystalline [Co(21 A) /Fe(24 A)]25 multilayer. The Co layers previously were shown to follow the bcc structure of Fe. The hyperfine field (Bhf) distribution was studied by NMR on59Co in the same sample. We applied the thermal cycling (TC) method at temperatures around 9 mK in the external magnetic field (Bext) range 0.05–1 T to determine the SLR, which was found for Co in bcc Co to be about seven times faster than the SLR of Co in Fe. Moreover, the (Bext) dependence of the SLR as observed for impurities in Fe and Co in fcc Co was not found.
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