Magnetic behavior of dense nanoparticle assemblies: Interplay of interparticle interactions and particle system morphology

2012 ◽  
Vol 86 (21) ◽  
Author(s):  
G. Margaris ◽  
K. N. Trohidou ◽  
V. Iannotti ◽  
G. Ausanio ◽  
L. Lanotte ◽  
...  
Keyword(s):  
Particle System ◽  
Magnetic Behavior ◽  
Interparticle Interactions ◽  
Nanoparticle Assemblies

scholarly journals Magnetic studies of 0.7(Fe2O3)/0.3(ZnO) nanocomposites in nanopowder form and dispersed in polymer matrix

2016 ◽  
Vol 34 (2) ◽  
pp. 286-296 ◽  
Author(s):  
Janusz Typek ◽  
Kamil Wardal ◽  
Grzegorz Zolnierkiewicz ◽  
Anna Szymczyk ◽  
Nikos Guskos ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Magnetic Behavior ◽  
Magnetic Studies ◽  
Static Magnetization ◽  
Interparticle Interactions ◽  
Neat Polymer ◽  
Two Samples ◽  
Poly Ethylene ◽  
Two Phases ◽  
Average Size

AbstractMagnetic properties of 0.7(Fe2O3)/0.3(ZnO) nanocomposite synthesized by traditional wet chemistry method and containing only two phases: ZnO (nonmagnetic) and ZnFe2O4 (magnetic, with nanocrystallites of average size 12 nm, but forming large agglomerates, up to 100 nm in size) were studied by DC magnetization and ferromagnetic resonance (FMR). The investigated nanocomposite was either in a form of nanopowder or dispersed at concentration of 0.1 wt.% in poly(ethylene naphthalate-block-tetramethylene oxide) PTMO-b-PEN polymer matrix. Similarities and differences in magnetic behavior of these two samples revealed by the study of static magnetization and FMR spectra have been discussed relative to different morphologies and the associated variation of interparticle interactions. Moreover, thermal and thermo-oxidative stability of the nanocomposite and the neat polymer have been studied by thermogravimetric method.

scholarly journals The effect of magneto-crystalline anisotropy on the properties of hard and soft magnetic ferrite nanoparticles

2019 ◽  
Vol 10 ◽  
pp. 1348-1359 ◽  
Author(s):  
Hajar Jalili ◽  
Bagher Aslibeiki ◽  
Ali Ghotbi Varzaneh ◽  
Volodymyr A Chernenko
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Magnetic Behavior ◽  
Soft Magnetic ◽  
Interparticle Interactions ◽  
Co Doping ◽  
Heat Efficiency ◽  
Crystalline Anisotropy ◽  
Structure Morphology ◽  
Magneto Crystalline Anisotropy

Recent advances in the field of magnetic materials emphasize that the development of new and useful magnetic nanoparticles (NPs) requires an accurate and fundamental understanding of their collective magnetic behavior. Studies show that the magnetic properties are strongly affected by the magnetic anisotropy of NPs and by interparticle interactions that are the result of the collective magnetic behavior of NPs. Here we study these effects in more detail. For this purpose, we prepared Co x Fe3− x O4 NPs, with x = 0–1 in steps of 0.2, from soft magnetic (Fe3O4) to hard magnetic (CoFe2O4) ferrite, with a significant variation of the magnetic anisotropy. The phase purity and the formation of crystalline NPs with a spinel structure were confirmed through Rietveld refinement. The effect of Co doping on structure, morphology and magnetic properties of Co x Fe3− x O4 samples was investigated. In particular, we examined the interparticle interactions in the samples by δm graphs and Henkel plots that have not been reported before in literature. Finally, we studied the hyperthermia properties and observed that the heat efficiency of soft Fe3O4 is about 4 times larger than that of hard CoFe2O4 ferrite, which was attributed to the high coercive field of samples compared with the external field amplitude.

Role of interparticle interactions on the magnetic behavior of Mg0.95Mn0.05Fe2O4ferrite nanoparticles

2008 ◽  
Vol 20 (23) ◽  
pp. 235214 ◽  
Author(s):  
S K Sharma ◽  
Ravi Kumar ◽  
Shalendra Kumar ◽  
M Knobel ◽  
C T Meneses ◽  
...  
Keyword(s):  
Magnetic Behavior ◽  
Interparticle Interactions

Magnetoelasticity of gels

2018 ◽  
Vol 29 (9) ◽  
pp. 1913-1927 ◽  
Author(s):  
Sakthivel T Kasinathan ◽  
Sivakumar M Srinivasan
Keyword(s):  
Polymer Matrix ◽  
Energy Minimization ◽  
Magnetic Particles ◽  
Structural Integrity ◽  
Mechanical Strain ◽  
Active Material ◽  
Magnetic Behavior ◽  
Interparticle Interactions ◽  
Multiple Length Scales ◽  
Equilibrium Magnetization

Magnetoelastic gel is an active material that is used widely these days. The behavior of these multifunctional gels is derived from a polymer matrix and magnetoresponsive inclusions. The polymer matrix provides structural integrity as well as load bearing capacity to the magnetoelastic gel. The magnetic behavior of the magnetoelastic gel is attributed to a large number of nano-to-micron-sized magnetic particles disbursed in the polymer matrix. The magnetoelastic gel is said to be diluted if the interparticle interactions are negligible/small or concentrated if there are strong interparticle interactions. We consider strong interparticle interactions in the magnetoelastic gel. When the magnetic field is applied to the magnetoelastic gel, the disbursed magnetic particles tend to translate and rotate to a new deformed configuration. Due to these translations and rotations of the many magnetoelastic particles, the polymer matrix around each particle deforms. These micro-deformations then coalesce and lead to the overall macroscopic deformation of the magnetoelastic gel. Both magnetization and mechanical strain characterize the magnetoelastic behavior of the magnetoelastic gel. In this article, an energy minimization approach is followed to find the equilibrium magnetization and strain. We formulate the total energy of the magnetoelastic gel on multiple-length scales and minimize it to obtain these equilibrium magnetization and mechanical strain. We also investigate the effect of particle size and polarization under the framework of energy minimization.

Magnetodeformational Anisotropy of FeGa/PU Hybrid Nanocomposite via Particle Concentration and Spatial Orientation

2015 ◽  
Vol 233-234 ◽  
pp. 607-610
Author(s):  
Tatiana Yu. Kiseleva ◽  
Sergey I. Zholudev ◽  
Alla A. Novakova ◽  
Tatiana S. Gendler ◽  
Igor A. Il’inych ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Volume Fraction ◽  
Magnetic Behavior ◽  
Spatial Arrangement ◽  
Mechanical Analysis ◽  
Interparticle Interactions ◽  
Dynamical Mechanical Analysis ◽  
Alloy Particles ◽  
Structure Morphology ◽  
Matrix Correlation

The present work has been undertaken to research effects of structure, morphology, volume fraction, spatial arrangement of magnetostrictive intermetallic FeGa alloy particles dispersed in modified polyurethane matrix. Correlation of composite magnetic behavior with structure and mechanical properties has been obtained by measurements of magnetostriction, remanent magnetization anisotropy, SEM, and dynamical mechanical analysis. Anisotropic chain structures of magnetic particles within the polymer with different interparticle interactions were observed. The increase of the magnetostrictive response with tailor-made magnetic anisotropy induced by magnetic particles volume fraction has been demonstrated

Comparative Analysis of γ-Fe2O3 Nanoparticles Magnetic Interactions in Different Polymeric Nanocomposites

2009 ◽  
Vol 152-153 ◽  
pp. 269-272 ◽  
Author(s):  
Tatiana S. Gendler ◽  
Alla A. Novakova ◽  
V.N. Prudnikov ◽  
G.P. Aleksandrova ◽  
L.A. Grishchenko
Keyword(s):  
Electron Microscopy ◽  
Magnetic Measurements ◽  
Magnetic Behavior ◽  
Superparamagnetic Nanoparticles ◽  
Magnetic Interactions ◽  
Self Organization ◽  
Polymeric Nanocomposites ◽  
Interparticle Interactions ◽  
Transmission Electron ◽  
The Comparative Study

The comparative study of Fe2O3 4-10nm nanoparticles incorporated in arabinogalactan and polyvinyl alcohol matrixes was performed by means of magnetic measurements in wide 5-900K temperature range, Mossbauer spectroscopy and transmission electron microscopy. The processes of nanoparticles different self-organization inside various polymer matrixes were revealed. These processes lead to unusual magnetic behavior of initially superparamagnetic nanoparticles owing to interparticle interactions.

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