Molecular dynamics simulations of the dipolar-induced formation of magnetic nanochains and nanoringsA. Hucht, S. Buschmann and P. Entel
Department of Physics, University of Duisburg-Essen - 47048 Duisburg, Germany
received 18 August 2006; accepted in final form 8 January 2007; published March 2007
published online 19 February 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.
75.50.Tt - Fine-particle systems; nanocrystalline materials.
64.70.-p - Specific phase transitions.
75.40.Mg - Numerical simulation studies.
© Europhysics Letters Association 2007