Magnetic Properties Dependence on Geometrical Parameters of Electroless-Plated Ni-Based Rhombohedral Nanotubes

Recent research that has brought huge scientific attention on ferromagnetic nanotubes as building blocks for nanoarchitectures and magnetic devices for technological applications are usually focused on cylindrical shape nanotubes, while only a few have been addressed with alternative three-dimensional geometries. Here, we present rhombohedral magnetic nanotubes obtained by a novel synthesis method based on electroless-plating deposition into the pores of ion-track etched muscovite mica templates, providing a precise control over nanotubes geometry. Both, pure nanocrystalline Ni and amorphous Ni-B nanotubes were fabricated and their magneto-structural properties were characterized as function of their geometrical parameters. Their magnetic properties dependence on increased deposition time were discussed which, in combination to micromagnetic simulations, allow to understand their intriguing magnetic behavior.