title: Creation of helical vortices during magnetization of aligned carbon nanotubes filled with Fe: theory and experiment.
abstract: We report a novel magnetic phenomenon consisting of the formation of helical spin configurations during the magnetization of densely packed ferromagnetic nanowires encapsulated inside carbon nanotubes. We studied the hysteresis loops when the magnetic fields are applied parallel and perpendicular to the nanotubes axes. We also performed theoretical calculations on aligned nanowire arrays that clearly indicate the creation of helical spin vortices in the hysteresis loops. The latter are caused by the presence of strong dipolar interactions among neighboring wires.
authors.affiliation: Advanced Materials Department, IPICYT, Camino a la Presa San José 2055, Lomas 4a sección, 78216 San Luis Potosí, San Luis Potosí, México.
authors.forename: F
authors.initials: F
authors.lastname: López-Urías
authors.forename: E
authors.initials: E
authors.lastname: Muñoz-Sandoval
authors.forename: M
authors.initials: M
authors.lastname: Reyes-Reyes
authors.forename: A H
authors.initials: AH
authors.lastname: Romero
authors.forename: M
authors.initials: M
authors.lastname: Terrones
authors.forename: J L
authors.initials: JL
authors.lastname: Morán-López