  The non-uniform magnetostatic field produced by the equilibrium and non
equilibrium magnetic states of magnetic nanotubes has been investigated
theoretically. We consider magnetic fields produced by actual equilibrium
states and transverse and vortex domain walls confined within the
nanostructure. Our calculations allow us to understand the importance of the
magnetostatic field in nanomagnetism, which is frequently considered as a
uniform field. Moreover, our results can be used as a basis for future research
of others properties, such as the investigation of spin waves when domain walls
are present, or the motion of a magnetic particle near a magnetic field.
