Fig. 6: Near-field magnetic field textures around the magnetic tetrapod.
From: Three-dimensional magnetic nanotextures with high-order vorticity in soft magnetic wireframes
a Streamlines of the magnetic field that have been obtained from the reconstructed magnetic state of the FEBID-grown tetrapod (Fig. 2h). The red-white-blue contrast depicts the magnetization distribution over the tetrapod surface, while the rainbow contrast represents the Bz component of the stray-field distribution. b Streamlines of the magnetic near-field originating from two surface antivortices in the central area of the tetrapod. Green regions show isosurfaces of the topological charge density \(\widetilde{\Omega }=0.03\). Families of c–e vertical and f–h horizontal cross-sections of the calculated distribution of the magnetic field texture. Color of individual arrows depicts the direction of the Bz component. Isosurfaces of \({B}_{{{{{{{{\rm{z}}}}}}}}}/{B}_{{{{{{{{\rm{z}}}}}}}}}^{\max }\) are bent due to the geometrical frustration of the experimental tetrapod geometry. The isosurfaces are shown for (i)\({B}_{{{{{{{{\rm{z}}}}}}}}}/{B}_{{{{{{{{\rm{z}}}}}}}}}^{\max }=0\), (j)\({B}_{{{{{{{{\rm{z}}}}}}}}}/{B}_{{{{{{{{\rm{z}}}}}}}}}^{\max }=3\times 1{0}^{-4}\) and (k)\({B}_{{{{{{{{\rm{z}}}}}}}}}/{B}_{{{{{{{{\rm{z}}}}}}}}}^{\max }=-3\times 1{0}^{-4}\). Further details on topological stray field nanotextures are summarized in Supplementary Section 8.
