title: Magnetic vortex chirality determination via local hysteresis loops measurements with magnetic force microscopy.
abstract: Magnetic vortex chirality in patterned square dots has been investigated by means of a field-dependent magnetic force microscopy technique that allows to measure local hysteresis loops. The chirality affects the two loop branches independently, giving rise to curves that have different shapes and symmetries as a function of the details of the magnetisation reversal process in the square dot, that is studied both experimentally and through micromagnetic simulations. The tip-sample interaction is taken into account numerically, and exploited experimentally, to influence the side of the square where nucleation of the vortex preferably occurs, therefore providing a way to both measure and drive chirality with the present technique.
authors.affiliation: INRIM, strada delle Cacce 91, 10135 Torino (TO), Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Coïsson
authors.affiliation: INRIM, strada delle Cacce 91, 10135 Torino (TO), Italy.|Università di Torino, via P. Giuria 7, 10125 Torino (TO), Italy.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Barrera
authors.affiliation: INRIM, strada delle Cacce 91, 10135 Torino (TO), Italy.
authors.forename: Federica
authors.initials: F
authors.lastname: Celegato
authors.affiliation: INRIM, strada delle Cacce 91, 10135 Torino (TO), Italy.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Manzin
authors.affiliation: INRIM, strada delle Cacce 91, 10135 Torino (TO), Italy.
authors.forename: Franco
authors.initials: F
authors.lastname: Vinai
authors.affiliation: INRIM, strada delle Cacce 91, 10135 Torino (TO), Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Tiberto