Fri, 25 Jul 2008 04:35:19 BST CiteULike: dchens Johansen http://www.citeulike.org/user/dchen/author/Johansen CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2766831 <i>Physical Review Letters, Vol. 100, No. 14. (2008)</i><br /><br />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. Colloidal Assembly on Magnetically Vibrated Stripes Pietro Tierno Thomas Fischer Tom Johansen Francesc Sagués doi:10.1103/PhysRevLett.100.148304 Physical Review Letters, Vol. 100, No. 14. (2008) 2008-05-07T15:36:01-00:00 2008 Physical Review Letters 100 14 APS clusters colloids magnetic