Abstract
Intriguing electromagnetic phenomena can show up in a solid when the electrons spins take a helical form. To name a few, the cycloidal order of spin moments can produce the electric polarization and realize the multiferroics where ferroelectric and magnetic orders coexist and enable the cross control of magnetism with electric field. When spin helices hybridize to form with plural propagation directions, there emerge the topological spin textures, such as magnetic skyrmions and emergent magnetic (anti)monopoles, hosting the large emergent magnetic field or Berry curvature acting on the conduction electrons and causing the gigantic topological Hall effect.
Furthermore, the dynamics of these helical-spin or skyrmion forms, as excited by electric current flow, can generate the emergent electric field acting on the electrons and hence cause a sort of electromagnetic induction. Such emergent electromagnetic induction based on the spin chiral matter is applied to the design of nanometric inductor element.
Here, those spin chiral textures and real-space topological spin textures are overviewed with perspectives of exploration for new quantum materials and functions.