Abstract
Formation of spiral magnetic structures in layered magnets with strong ferromagnetic intralayer and weak interlayer exchange interactions has been investigated. It is shown that in the sample containing r different magnetic layers there can form only spiral structures, which represent r simple spirals with an identical pitch nested into each other. At r = 2, only one stable double spiral can exist in the magnet. A comparison of the results obtained with the data of the analysis of neutron scattering on the layered compounds YMn6Sn6 suggests that in real crystals a large role belongs to the in-plane magnetic anisotropy which transforms the double spiral into a modulated commensurate long-period structure.
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