Micromagnetic simulations of interacting dipoles on a fcc lattice: Application to nanoparticle assemblies

TL;DR

This paper uses micromagnetic simulations to study how dipole interactions, anisotropy, and temperature influence magnetic behavior in nanoparticle assemblies on fcc and sc lattices, aligning well with experimental data.

Contribution

It introduces a simple model of interacting dipoles on fcc and sc lattices that explains experimental magnetization data of nanoparticle arrays, highlighting the role of interactions.

Findings

Simulations match experimental M-H loops for nanoparticle arrays.

Interactions significantly affect magnetic properties in fcc lattices.

Surface effects influence thermal fluctuations in magnetic nanoparticles.

Abstract

Micromagnetic simulations are used to examine the effects of cubic and axial anisotropy, magnetostatic interactions and temperature on M-H loops for a collection of magnetic dipoles on fcc and sc lattices. We employ a simple model of interacting dipoles that represent single-domain particles in an attempt to explain recent experimental data on ordered arrays of magnetoferritin nanoparticles that demonstrate the crucial role of interactions between particles in a fcc lattice. Significant agreement between the simulation and experimental results is achieved, and the impact of intra-particle degrees of freedom and surface effects on thermal fluctuations are investigated.