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Interaction Effects in Assembly of Magnetic Nanoparticles
- Source :
- Nanoscale Research Letters, Vol 12, Iss 1, Pp 1-8 (2017), Nanoscale Research Letters
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- A specific absorption rate of a dilute assembly of various random clusters of iron oxide nanoparticles in alternating magnetic field has been calculated using Landau- Lifshitz stochastic equation. This approach simultaneously takes into account both the presence of thermal fluctuations of the nanoparticle magnetic moments, and magneto-dipole interaction between the nanoparticles of the clusters. It is shown that for usual 3D clusters the intensity of magneto- dipole interaction is determined mainly by the cluster packing density eta = Np*V/Vcl, where Np is the average number of the particles in the cluster, V is the nanoparticle volume, and Vcl is the cluster volume. The area of the low frequency hysteresis loop and the assembly specific absorption rate have been found to be considerably reduced when the packing density of the clusters increases in the range of 0.005 < eta < 0.4. The dependence of the specific absorption rate on the mean nanoparticle diameter is retained with increase of eta, but becomes less pronounced. For fractal clusters of nanoparticles, which arise in biological media, in addition to considerable reduction of the absorption rate, the absorption maximum is shifted to smaller particle diameters. It is found also that the specific absorption rate of fractal clusters increases appreciably with increase of the thickness of nonmagnetic shells at the nanoparticle surfaces.<br />The paper is accepted for Nanoscale Res. Lett
- Subjects :
- FOS: Physical sciences
Nanoparticle
Thermal fluctuations
Numerical simulation
02 engineering and technology
75.40.Mg
01 natural sciences
Molecular physics
75.20.-g
Iron oxide nanoparticles
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
lcsh:TA401-492
Cluster (physics)
General Materials Science
Absorption (electromagnetic radiation)
010302 applied physics
Physics
Specific absorption rate
Condensed Matter - Mesoscale and Nanoscale Physics
Magnetic moment
Nano Idea
021001 nanoscience & nanotechnology
Condensed Matter Physics
Magneto-dipole interaction
75.50.Tt
Dipole
Magnetic nanoparticles
lcsh:Materials of engineering and construction. Mechanics of materials
0210 nano-technology
Subjects
Details
- ISSN :
- 1556276X and 19317573
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Nanoscale Research Letters
- Accession number :
- edsair.doi.dedup.....2e3964fc8d227925f26dc6cac380345a