During the last years great attention has been given to the encapsulation of magnetic
nanoparticles. In this work we investigated the stability of small magnetic particles inside
magnetic nanotubes. Multisegmented geometries were tested in order to optimize the
stability of the particle inside the nanotubes. Our results evidenced that multisegmented
nanotubes are more efficient to entrap the particles at temperatures up to hundreds of
kelvins.