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Title: Enhanced diffusion and anomalous transport of magnetic colloids driven above two state flashing potential
Author: Tierno, Pietro
Shaebani, Reza
Keywords: Col·loides
Dinàmica d'una partícula
Rutes aleatòries (Matemàtica)
Dynamics of a particle
Random walks (Mathematics)
Issue Date: 23-Feb-2016
Publisher: Royal Society of Chemistry
Abstract: We combine experiments and theory to investigate the diffusive and the subdiffusive dynamics of paramagnetic colloids driven above a two-state flashing potential. The magnetic potential was realized by periodically modulating the stray field of a magnetic bubble lattice in a uniaxial ferrite garnet film. At large amplitudes H0 of the driving field, the dynamics of the particle resemble an ordinary random walk with a frequency-dependent diffusion coefficient. However, subdiffusive and oscillatory dynamics at short time scales are observed when decreasing H0. We present a persistent random walk model to elucidate the underlying mechanism of motion, and perform numerical simulations to demonstrate that the anomalous motion originates from the dynamic disorder in the structure of the magnetic lattice, induced by the slightly irregular shape of bubbles
Note: Versió postprint del document publicat a:
It is part of: Soft Matter, 2016, vol. 12, p. 3398-3405
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ISSN: 1744-683X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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