Soba, A.Tierno, PietroFischer, Thomas M.Sagués i Mestre, Francesc2011-07-072011-07-0720081063-651Xhttps://hdl.handle.net/2445/18924We present a theoretical study of the recently observed dynamical regimes of paramagnetic colloidal particles externally driven above a regular lattice of magnetic bubbles [P. Tierno, T. H. Johansen, and T. M. Fischer, Phys. Rev. Lett. 99, 038303 (2007)]. An external precessing magnetic field alters the potential generated by the surface of the film in such a way to either drive the particle circularly around one bubble, ballistically through the array, or in triangular orbits on the interstitial regions between the bubbles. In the ballistic regime, we observe different trajectories performed by the particles phase locked with the external driving. Superdiffusive motion, which was experimentally found bridging the localized and delocalized dynamics, emerge only by introducing a certain degree of randomness into the bubbles size distribution.4 p.application/pdfeng(c) American Physical Society, 2008Química físicaMicroelectrònicaAparells electrònicsDispositius magnèticsFísica estadísticaSistemes no linealsPhysical chemistryMicroelectronicsElectronic apparatus and appliancesMagnetic devicesStatistical physicsThermodynamicsNonlinear systemsinfo:eu-repo/semantics/article561523info:eu-repo/semantics/openAccess