A new interpretation of nuclear magnetic resonance in dilute ferromagnetic alloys

Abstract

The effect of dipolar and quadrupole interactions on the nuclear magnetic resonance line shape from a ferromagnet is calculated by taking an average over the domain wall weighted by the enhancement factor which varies through the wall. The results obtained disagree with the earlier work of Portis and Kanamori who used intuitive arguments to obtain the positions of the dipolar satellites. Detailed line shapes are calculated for face-centred cubic and body-centred cubic lattices which contain impurity atoms producing dipolar magnetic fields and electric quadrupole fields on their neighbours and also for hexagonal lattices where homogeneous electric field gradients are present. These are compared with experiment and used to reinterpret the available data and to show that the observed satellite lines generally come from different shells of neighbours and not from dipolar splitting as suggested by Portis and Kanamori.