Abstract
Nuclear spin-lattice relaxation (NSLR) of guest atoms in a ferromagnetic host metal is studied by means of nuclear orientation of radioactive isotopes at low temperatures. The sample, a ferromagnetic, tron single crystal containing58Co or60Co impurities, is cooled to about 20 mK and the lattice is warmed up by r.f. heating, whereafter the nuclear polarization is monitored by gamma-ray intensity measurements versus time. The results show a considerable influence of external magnetic fields and, in particular, also isotope effects. These will be discussed on the basis of second-order magnon processes.
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