title: Giant transversal particle diffusion in a longitudinal magnetic ratchet.
abstract: We study the transversal motion of paramagnetic particles on a uniaxial garnet film, exhibiting a longitudinal ratchet effect in the presence of an oscillating magnetic field. Without the field, the thermal diffusion coefficient obtained by video microscopy is D(0) ≈ 3 × 10(-4)  μm2/s. With the field, the transversal diffusion exhibits a giant enhancement by almost four decades and a pronounced maximum as a function of the driving frequency. We explain the experimental findings with a theoretical interpretation in terms of random disorder effects within the magnetic film.
authors.affiliation: Departament de Química Física, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain. ptierno@ub.edu
authors.forename: Pietro
authors.initials: P
authors.lastname: Tierno
authors.forename: Peter
authors.initials: P
authors.lastname: Reimann
authors.forename: Tom H
authors.initials: TH
authors.lastname: Johansen
authors.forename: Francesc
authors.initials: F
authors.lastname: Sagués