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A theory of Kondo lattices is applied to studying possible magnetic andcharge structures of itinerant-electron antiferromagnets. Even helical spinstructures can be stabilized when the nesting of the Fermi surface is not sharpand the superexchange interaction, which arises from the virtual exchange ofpair excitations across the Mott-Hubbard gap, is mainly responsible formagnetic instability. Sinusoidal spin structures or spin density waves (SDW)are only stabilized when the nesting of the Fermi surface is sharp enough and anovel exchange interaction arising from that of pair excitations ofquasi-particles is mainly responsible for magnetic instability. In particular,multiple SDW are stabilized when their incommensurate ordering wave-numbers$\pm{\bf Q}$ are multiple; magnetizations of different $\pm{\bf Q}$ componentsare orthogonal to each other in double and triple SDW when magnetic anisotropyis weak enough. Unless $\pm 2{\bf Q}$ are commensurate, charge density waves(CDW) with $\pm 2{\bf Q}$ coexist with SDW with $\pm{\bf Q}$. Because thequenching of magnetic moments by the Kondo effect depends on local numbers ofelectrons, the phase of CDW or electron densities is such that magnetic momentsare large where the quenching is weak. It is proposed that the so called stipeorder in cuprate-oxide high-temperature superconductors must be the coexistingstate of double incommensurate SDW and CDW.Comment: 10 pages, no figure

Magnetic and charge structures in itinerant-electron magnets: Coexistence of multiple spin-density and charge-density waves