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Lorentz transmission electron microscopy (LTEM) investigations of modulatedstates in a FeGe wedge and detailed calculations demonstrate that chiral twistsarising near the surfaces of noncentrosymmetric ferromagnets (Meynell et al.Phys. Rev. B, 90, 014406 (2014)) provide a stabilization mechanism for skyrmionlattices and helicoids in cubic helimagnet nanolayers. The calculated magneticphase diagram for free standing cubic helimagnet nanolayers shows thatmagnetization processes in these compounds fundamentally differ from those inbulk cubic helimagnets and are characterized by the first-order transitionsbetween modulated phases and the formation of specific multidomain states. Thepaper reports LTEM observations of multidomain patterns in FeGe free-standingnanolayers.

Chiral surface twists and skyrmion stability in nanolayers of cubic helimagnets