The nuclear magnetic resonance of Co59 and hyperfine fields in Fe-Co alloy

The nuclear magnetic resonance of Co⁵⁹ in an Fe-Co alloy was studied for a concentration of 4 to 17% Co. The resonance frequency was found to be independent of the concentration in this range. This observation is discussed together with the experimentally found dependence of the hyperfine field of iron in this alloy on the concentration of Co [8]. Use is made of a band model for 3d electrons of iron, in which the Co atoms behave as impurities on which certain wave functions of the band are localized and other delocalized. The values obtained for the line width show the presence of a mechanism of broadening, dependent on 3d wave functions.