Ferromagnetic resonance spectrum in metals with collinear magnetic ordering

Model of interacting collinear spin and orbital magnetic moments localized near the lattice sites, is proposed. The said model allows to found a new area of the ferromagnetic resonance spectrum. By means of the molecular field theory the constant of interaction of magnetic moment of two selected sub-systems, is evaluated. This enables to locate the ferromagnetic resonance area that can be both in microwave and optical spectra.