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oai:recercat.cat:2445/132712025-11-19T20:35:45Zcom_2072_1057col_2072_478796col_2072_478917

00925njm 22002777a 4500 dc Tierno, Pietro author Fischer, Thomas M. author Johansen, Tom H. author Sagués i Mestre, Francesc author 2010-07-05T09:30:15Z 2010-07-05T09:30:15Z 2008 We investigate the collective organization of paramagnetic colloidal particles externally driven above the periodic stripes of a uniaxial ferrimagnetic garnet film. An external field modulation induces vibration of the stripe walls and produces random motion of the particles. Defects in the stripe pattern break the symmetry of the potential and favor particle nucleation into large clusters above a critical density. Mismatch between particle size and pattern wavelength generates assemblies with different morphological order. At even higher field strengths, repulsive dipolar interactions between the particles induce cluster melting. We propose a novel approach to generate and externally control a variety of colloidal assemblies. Química física Transformacions de fase (Física estadística) Physical chemistry and chemical physics Phase transformations (Statistical physics) Colloidal assembly on magnetically vibrated stripes