Magnetization in uniaxial spherical nanoparticles: consequence on the interparticle interaction

Details Magnetization in uniaxial spherical nanoparticles: consequence on the interparticle interaction Magnetization in uniaxial spherical nanoparticles: consequence on the interparticle interaction

2009-03-27

arxiv.org/abs/0903.4924v1

Physics

Condensed Matter

Materials Science

4 pages, proceeding of the JEMS 2008. To be published in the Journal of Magnetism and Magnetic Materials (available at http:

Scientific paper

10.1016/j.jmmm.2009.03.032

We investigate the interaction between spherical magnetic nanoparticles which present either a single domain or a vortex structure. First the magnetic structure of a uniaxial soft sphere is revisited, and then the interaction energy is calculated from a micromagnetic simulation. In the vortex regime the orientation of the vortex relative to the easy axis depends on both the particle size and the anisotropy constant. We show that the leading term of the interaction is the dipolar interaction energy between the magnetic moments. For particles presenting a vortex structure, we show that the polarization due to the dipolar field must be included. The parameters entering in the dipolar interaction are deduced from the magnetic behavior of the isolated particle.

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