On the Existence of Spin Waves in a Model Transition Metal with Finite Anderson Mixing Potential

Interband s–d exchange interaction is added to the transition metal model Hamiltonian involving the Anderson mixing term. Spin waves are shown to exist even when the Anderson mixing potential remains finite. The value of the exchange coupling constant which makes this possible depends on the mutual localization of s‐and d‐like bands and on the shape of the density of states function of the s‐like band.