Ground State of Magnetic Dipoles on a Two-Dimensional Lattice: Structural Phases in Complex Plasmas

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J. D. Feldmann,¹ G. J. Kalman,¹ P. Hartmann,² and M. Rosenberg³
¹Department of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, Massachusetts, 02467, USA
²Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
³Department of Electrical and Computer Engineering, University of California–San Diego, La Jolla, California, 92093, USA

Received 19 May 2007; published 26 February 2008

Westudy analytically and by molecular dynamics simulations the ground stateconfiguration of a system of magnetic dipoles fixed on atwo-dimensional lattice. We find different phases, in close agreement withprevious results. Building on this result and on the minimumenergy requirement we determine the equilibrium lattice configuration, the magneticorder (ferromagnetic versus antiferromagnetic), and the magnetic polarization direction ofa system of charged mesoscopic particles with magnetic dipole moments,in the domain where the strong electrostatic coupling leads toa crystalline ground state. Orders of magnitudes of the parametersof the system relevant to possible future dusty plasma experimentsare discussed.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.085001
DOI:	10.1103/PhysRevLett.100.085001
PACS:	52.27.Lw 52.27.Lw Dusty or complex plasmas; plasma crystals YEAR: 2008

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