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The ground-state magnetic phase diagram is calculated within the Hubbard and$s$-$d$ exchange (Kondo) models for square and simple cubic lattices vs. bandfilling and interaction parameter. The difference of the results owing to thepresence of localized moments in the latter model is discussed. We employ ageneralized Hartree-Fock approximation (HFA) to treat commensurateferromagnetic (FM), antiferromagnetic (AFM), and incommensurate (spiral)magnetic phases. The electron correlations are taken into account within theHubbard model by using the Kotliar-Ruckenstein slave boson approximation (SBA).The main advantage of this approach is a correct qualitative description of theparamagnetic phase: its energy becomes considerably lower as compared with HFA,and the gain in the energy of magnetic phases is substantially reduced.

Spiral magnetic order, non-uniform states and electron correlations in the conducting transition metal systems