Structure of Magnetic Domain Wall in Cylindrical Microwire

Within a simple model, we study magnetic domain walls (DWs) inside the inner core of the amorphous ferromagnetic microwire whose spin ordering is a core-shell structure. The interaction of the (internal stress created) outer shell of the wire on the inner core is included into the Landau-Lifshitz equation via an effective Dzyaloshinskii-Moriya-like anisotropy. The resulting DW textures are classified. The model is applicable to the nanowires of a modulated diameter (periodically constricted nanowires) as well. In that case, a core-shell magnetic structure is of the purely magnetostatic origin. Because the micromagnetic simulations of the microwires are extremely challenging, the simulations of the structured nanowires are performed with the purpose of verifying analytical predictions on the shape of the DW.