Giant transversal particle diffusion in a longitudinal magnetic ratchet

Details Giant transversal particle diffusion in a longitudinal magnetic ratchet Giant transversal particle diffusion in a longitudinal magnetic ratchet

2010-12-15

arxiv.org/abs/1012.3343v1

Phys. Rev. Lett. 105, 230602 (2010)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

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 $D_{0}\approx 3\times 10^{-4}$ $\mu m^2/s$. 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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