Quasiparticle dynamics in ferromagnetic compounds of the Co–Fe and Ni–Fe systems I. A. Nechaev and E. V. Chulkov Eur. Phys. J. B, 77 1 (2010) 31-40 Published online: 06 August 2010 DOI: 10.1140/epjb/e2010-00236-9