Electron-magnon interactions in Ni

Abstract

We demonstrate that the minority-spin-electron (or majority-spin-hole) self-energy due to magnon exchange for the case of strong ferromagnetism can be calculated from the one-electron energy bands of the local-spin-density-functional Hamiltonian. This is a good model for Ni where we estimate both the real and imaginary parts of the majority-spin-hole self-energy to be less than 0.01 eV, thus demonstrating that many-body effects play no role in the photoelectron-spin-polarization reversal observed in Ni.