Domain walls confined in magnetic nanotubes with uniaxial anisotropy

We present calculations of the different domain wall structures confined in magnetic nanotubes, such as transverse wall, asymmetric vortex wall, branch fashion wall, and horse-saddle wall. The wall structures were calculated by micromagnetic simulations. The tube radii R = 50 nm and 100 nm, and aspect ratios length/radius L/R <= 15 were considered. The magnetic phase diagrams of the stability of different kinds of the domain walls were plotted as function of the tube aspect ratio L/R and the tube thickness (difference of the outer and inner tube radii). We found that the domain wall internal structures confined in nanotubes depend mainly on the sizes of the tubes almost without varying with the tube material parameters. The obtained results offer a way to design the magnetization structures for the domain wall based devices by controlling the nanotube geometric parameters. (c) 2012 Elsevier B.V. All rights reserved.