Nuclear Magnetic Resonance in Dilute Ni-Base Alloys

The nuclear magnetic resonance (NMR) of impurity nuclei have been observed in Ni-base alloys using a steady state method and a spin echo method. Firstly, measurments of the NMR frequency of the Cuv s , Niv 1, Cou y , Feu w and Mnu u nuclei in Ni alloys was measured as a function of temperature in the range from 4.2°K to 550°K, respectively. The temperature dependences of the internal fields are not identical to that of the magnetization of Ni host. The discrepancy depends on the hyperfine constant. Furthermore, the pressure dependence of their fields at 273°K in the range 1 to 8000 kg/cm2 has been measured with the result that the dl_nH_i/dP of Cuv s , Nv 1, Cou y and Mnu u nuclei in Ni alloys are 1.66×10{ w (kg/c㎡){ 1, 1.20×10{ v (kg/c㎡){ 1, 1.74×10{ w (kg/c㎡){ 1 and -3.32×10{ w (kg/cm2){ 1, respectively. It is found that the resonance frequency of the impurity nuclei is not proportional to the bulk magnetization even at constant volume. A brief discussion on mechanisms possible as the source of the exchange interaction is given.Article信州大学理学部紀要 4(1): 25-37(1969)departmental bulletin pape