Attraction-driven aggregation of dipolar particles in an external magnetic field

Gergo Pál, Ferenc Kun, Imre Varga, Dóra Sohler, Gang Sun

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Abstract

We present a detailed experimental study of the aggregation of particles of permanent magnetic moment in an external magnetic field. The experiments are performed with millimeter-sized particles floating on the surface of water. Due to the large size of the particles, thermal noise does not have any relevance in the system; the particles undergo deterministic motion. Experiments are carried out varying the concentration which also controls the relative importance of the dipole-external field and the dipole-dipole interactions. We determined the exponents characterizing the aggregation process and found that the attraction driven aggregation of dipolar particles obeys the Vicsek-Family dynamic scaling. The exponents are found to have a concentration dependence which can be attributed to the change of mobility of clusters and their interaction at higher concentrations.

Original languageEnglish
Article number061504
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume83
Issue number6
DOIs
Publication statusPublished - Jun 16 2011

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ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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