Clusters of charged diamagnetic particles levitating in nonuniform magnetic field S. F. Savin, L. G. D'yachkov, M. M. Vasiliev, O. F. Petrov and V. E. Fortov EPL, 88 6 (2009) 64002 Published online: 05 January 2010 DOI: 10.1209/0295-5075/88/64002