Hopfions in screw chiral magnets

Three-dimensional topological spin textures have attracted growing interest due to their rich geometry and potential for functional magnetic phenomena. In this work, we introduce a new class of magnetic models, termed screw chiral magnets. We show that these systems support metastable Hopfions and other three-dimensional topological textures in a ferromagnetic background. These solitons exhibit distinctive physical properties, including unconventional Goldstone modes. The models are obtained via a systematic symmetry transformation of the bulk chiral magnet. Our results establish screw chiral magnets as a new class of magnetic models supporting Hopfions in ferromagnetic backgrounds and identify symmetry transformations as a general route to generate systems with nontrivial three-dimensional textures.