Abstract
The nuclear spin-lattice relaxation times T 1 for Cu 63 and Mn 55 in metallic ferromagnets CuCr 2 S 4 and β 1 -MnZn have been measured as a function of temperature. The nuclear relaxation rates T 1 -1 for nuclei in domains show large deviations from T 1 T =constant at high temperature, where T is the temperature, and satisfy T 1 -1 = a T + b T n with a =0.38, b =4.8×10 -7 and n =3.5±0.2 for Cu 63 in CuCr 2 S 4 and a =2.3, b =0.70×10 -7 and n =4.0±0.2 for Mn 55 in β 1 -MnZn. The nuclear relaxation is due to the process involving itinerant electrons in the low temperature region and predominantly due to the three-magnon process in the high temperature region.
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