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Giant transversal particle diffusion in a longitudinal magnetic ratchet

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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     μ m 2 / 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.

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Articles publicats en revistes (Ciència dels Materials i Química Física)

# metadata.dc.title[].value
Giant transversal particle diffusion in a longitudinal magnetic ratchet