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Zero-Field and Field-Induced Interactions between Multicore Magnetic Nanoparticles

1
Institute of Continuous Media Mechanics UB RAS, Perm Federal Research Center UB RAS, Perm 614013, Russia
2
Physics of Phase Transitions Department, Perm State University, Perm 614990, Russia
Nanomaterials 2019, 9(5), 718; https://doi.org/10.3390/nano9050718
Received: 17 April 2019 / Revised: 2 May 2019 / Accepted: 5 May 2019 / Published: 9 May 2019
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Abstract

In this paper, the Langevin dynamics simulation method is used to study magnetic interactions between a pair of multicore magnetic nanoparticles subjected to a uniform magnetic field. Multicore nanoparticles are modelled as spherical rigid clusters of single-domain superparamagnetic cores coupled via dipole-dipole interactions. It is shown that the magnetic force between two well-separated clusters in a strong applied field can be accurately described within the induced point-dipole approximation. However, this approximation also assumes that there are no interactions between clusters in the zero-field limit. On the contrary, simulations indicate the existence of a relatively small attractive magnetic force between clusters, even in the absence of an applied field. It is shown that this force is a direct superparamagnetic analog of the van der Waals interaction between a pair of dielectric spheres. View Full-Text
Keywords: multicore magnetic nanoparticles; magentic nanoclusters; magnetic interactions; Langevin dynamics simulations multicore magnetic nanoparticles; magentic nanoclusters; magnetic interactions; Langevin dynamics simulations
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Kuznetsov, A.A. Zero-Field and Field-Induced Interactions between Multicore Magnetic Nanoparticles. Nanomaterials 2019, 9, 718.

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