Field tunable three-dimensional magnetic nanotextures in cobalt-nickel nanowires

Cylindrical magnetic nanowires with large transversal magnetocrystalline anisotropy have been shown to sustain nontrivial configurations resulting from the interplay of spatial confinement, exchange, and anisotropies. Exploiting these peculiar three-dimensional (3D) spin their solitonic inhomogeneities is expected improve magnetization switching in future spintronics, such as power-saving memory logic applications. Here we employ holographic vector-field electron tomography reconstruct remanent states CoNi 10 nm resolution 3D, a particular focus on domain walls between ubiquitous real-structure effects stemming irregular morphology variations. By tuning applied field direction, both longitudinal transverse multivortex different chiralities 3D features shifted vortex cores are stabilized. The chiral wall vortices opposite exhibits complex shape characterized by push out central line gain exchange energy. A similar texture, including bent lines, forms at boundary transverse-vortex configurations. Micromagnetic simulations allow an understanding origin observed states.