  We consider magnetization configurations at chiral magnet (CM)/ferromagnet
(FM) heterostructures. In the CM, magnetic skyrmions and spin helices emerge
due to the Dzyaloshinskii-Moriya interaction, which then penetrate into the
adjacent FM. However, because the non-uniform magnetization structures are
energetically unfavorable in the FM, the penetrated magnetization structures
are deformed, resulting in exotic three-dimensional configurations, such as
skyrmion cones, sideways skyrmions, and twisted helices and skyrmions. We
discuss the stability of possible magnetization configurations at the CM/FM and
CM/FM/CM hybrid structures within the framework of the variational method, and
find that various magnetization configurations appear in the ground state, some
of which cause nontrivial emergent magnetic field.
