HAL: hal-00371482, version 1

arXiv: 0903.4924

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Magnetization in uniaxial spherical nanoparticles: consequence on the interparticle interaction

Vincent Russier 1

(2009-03-28)

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.

1:	Institut de Chimie et des Matériaux Paris-Est (ICMPE)
	CNRS : UMR7182 – Université Paris XII - Paris Est Créteil Val-de-Marne

Subject

:

Physics/Condensed Matter/Materials Science

Keyword(s): magnetic nanoparticles – micrognetic simulations – dipolar interaction

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From: Vincent Russier <>

Submitted on: Saturday, 28 March 2009 08:53:19

Updated on: Saturday, 28 March 2009 08:56:12