Reversal modes in magnetic nanotubes
  The magnetic switching of ferromagnetic nanotubes is investigated as a function of their geometry. Two independent methods are used: Numerical simulations and analytical calculations. It is found that for long tubes the reversal of magnetization is achieved by two mechanism: The propagation of a transverse or a vortex domain wall depending on the internal and external radii of the tube. 
P. Landeros, S. Allende, J. Escrig, E. Salcedo, D. Altbir and E. E.   Vogel