Volume 77, Number 5, March 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 February 2007|
Molecular dynamics simulations of the dipolar-induced formation of magnetic nanochains and nanorings
Department of Physics, University of Duisburg-Essen - 47048 Duisburg, Germany
Accepted: 8 January 2007
Iron, cobalt and nickel nanoparticles, grown in the gas phase, are known to arrange in chains and bracelet-like rings due to the long-range dipolar interaction between the ferromagnetic (or super-paramagnetic) particles. We investigate the dynamics and thermodynamics of such magnetic dipolar nanoparticles for low densities using molecular dynamics simulations and analyze the influence of temperature and external magnetic fields on two- and three-dimensional systems. The obtained phase diagrams can be understood by using simple energetic arguments.
PACS: 75.50.Tt – Fine-particle systems; nanocrystalline materials / 64.70.-p – Specific phase transitions / 75.40.Mg – Numerical simulation studies
© Europhysics Letters Association, 2007
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