Critical dynamics of an interacting magnetic nanoparticle system

Abstract

Effects of dipole-dipole interactions on the magnetic relaxation have been investigated for three Fe-C nanoparticle samples with volume concentrations of 0.06, 5 and 17 vol%. While both the 5 and 17 vol% samples exhibit collective behavior due to dipolar interactions, only the 17 vol% sample displays critical behavior close to its transition temperature. The behaviour of the 5 vol% sample can be attributed to a mixture of collective and single particle dynamics.

19 pages, 8 figures

References in corpus (3)

• Non-equilibrium dynamics in an interacting nanoparticle system
• Relaxation time of weakly interacting superparamagnets
• Spin glass like transition in a highly concentrated Fe-C nanoparticle system

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• Magnetic properties of nanoparticles compacts with controlled broadening of the particle size distribution
• Viscosity of a sheared correlated (near-critical) model fluid in confinement