Magnetization in uniaxial spherical nanoparticles: consequence on the interparticle interaction

TL;DR

This paper explores how the magnetic structure of uniaxial spherical nanoparticles influences their interparticle interactions, emphasizing the role of vortex states and dipolar interactions through micromagnetic simulations.

Contribution

It provides a detailed analysis of magnetic interactions considering vortex states and polarization effects, advancing understanding of nanoparticle magnetic behavior.

Findings

Dipolar interaction dominates between particles.

Vortex orientation depends on size and anisotropy.

Dipolar field polarization affects interaction energy.

Abstract

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.