Size and polydispersity effect on the magnetization of densely packed magnetic nanoparticles

Abstract

The magnetic properties of densely packed magnetic nanoparticles (MNP) assemblies are investigated from Monte Carlo simulations. The case of iron oxide nanoparticles is considered as a typical example of MNP. The main focus is put on particle size and size polydispersity influences on the magnetization curve. The particles are modeled as uniformly magnetized spheres isolated one from each other by a non magnetic layer representing the organic coating. A comparison with recent experimental results on $\gamma -$Fe${}_2$O${}_3$ powder samples differing by their size is given.

To be published in the Journal of Applied Physics, to be found at http://jap.aip.org/

References in corpus (2)

• Effective anisotropies and energy barriers of magnetic nanoparticles with Neel surface anisotropy
• Mapping Monte Carlo to Langevin dynamics: A Fokker-Planck approach