Interaction and size effects in magnetic nanoparticles

Blanco-Mantecón, M.; O’Grady, K.

doi:10.1016/j.jmmm.2004.11.580

Cited by 107 publications

(78 citation statements)

References 23 publications

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“…6 that the SFD is broad and this may be caused by the defects in nanotubes and the diameter distribution of the nanotubes. χ irr curve obtained from the DCD curve is finite at zero field, indicating that at room temperature a considerable proportion of the particles are superparamagnetic and do not contribute to the remanence [19]. As can be seen in Fig.…”

Section: Methodsmentioning

confidence: 80%

“…5 shows the isothermal remanent magnetization (IRM) and DC de-magnetization (DCD) with applied field parallel to the tube axis at room temperature. The study of remanence curves (IRM and DCD) is a commonly used method to determine the energy barrier distribution in nano materials systems [19]. It is important to note that, in general, M(H) loops are determined by an admixture of both reversible and irreversible magnetization processes.…”

Section: Methodsmentioning

confidence: 99%

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Magnetic Interaction in FeCo Alloy Nanotube Array

Zhou¹,

Wang²,

Zhu³

et al. 2011

Journal of Magnetics

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An array of FeCo nanotubes has been successfully fabricated in the pores of porous anodic aluminum oxide (AAO) templates by wetting templates method. The morphology and structure of the nanotube array were characterized by scanning electron microscopy, transmission electron microscopy and x-ray diffraction. The average diameter of the nanotubes was about 200 nm, and the length was more than 10 µm. Vibrating sample magnetometer and superconducting quantum interference device were used to investigate the magnetic properties of the nanotube array. Interaction between the nanotubes has been found to be demagnetizing as expected and the switching field distribution is broad.

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Section: Methodsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Magnetic Interaction in FeCo Alloy Nanotube Array

Zhou¹,

Wang²,

Zhu³

et al. 2011

Journal of Magnetics

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“…For the ZnFe 2 O 4 solgel system, the magnetization mechanism could be Brownian rotation of moments fixed inside particles since the moments could be pinned. Hence, the gels are different from the so-called frozen ferrofluids in the low-temperature regime, in which only Néel rotation is possible (Blanco-Mantecón et al, 2006). Gelation "freezes" the translational degree of freedom and inhibits the hydrodynamic interaction, so that the apparent susceptibility and magnetization of gels are larger than those of sols.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Gelation on the Apparent Magnetism of ZnFe2O4 Sol-Gel Systems

Lin¹,

Li²,

Liu³

et al. 2013

APR

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Experiments have shown that for thixotropic solgel systems consisting of ZnFe 2 O 4 nanoparticles without any matrix material, the measured magnetization, or susceptibility of gels, are greater than those of sols. For the reduced susceptibility, a system with a volume fraction of particles of  v =2.0% is lower than a system with  v =1.5%. These results have been interpreted in terms of a magnetization mechanism based on the Brownian rotation of the moments fixed inside the colloidal particles, which would be dramatically affected by the non-magnetic hydrodynamic interaction. For weakly cross-linked gels, the translational degree of freedom is "frozen" while the rotational degree of freedom remains unchanged, so that their hydrodynamic interaction effect is weaker, and they are more easily magnetized than the sols with both rotational and translational degrees of freedom. The action of gelation preventing the hydrodynamic interaction effect on the magnetization process can be referred to as the "gelation decoupling". Correspondingly, such behavior of the hydrodynamic interaction in affecting the apparent magnetism can be referred to as a "viscomagnetic effect".

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“…As soon as the small inter-particle interactions are minimized, the superparamagnetic response of the shell spins dominates in controlling the low temperature magnetic behaviour of the material. The increase of particle concentration in the matrix contributes to a significant amount of dipole-dipole interactions [3,9,11,28], which effectively increase the anisotropy energy (E eff ∝ T B ) of the nanoparticles. The particle moments are randomly blocked along the local anisotropy axes, created by the inter-particle (dipole-dipole) interactions from the neighbouring particles.…”

Section: Discussionmentioning

confidence: 99%

Magnetic response of NiFe2O4 nanoparticles in polymer matrix

Poddar

Bhowmik

et al. 2009

Journal of Magnetism and Magnetic Materials

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We report the magnetic properties of magnetic nano-composite, consisting of different quantity of NiFe 2 O 4 nanoparticles in polymer matrix. The nanoparticles exhibited a typical magnetization blocking, which is sensitive on the variation of magnetic field, mode of zero field cooled/field cooled experiments and particle quantity in the matrix. The samples with lower particle quantity showed an upturn of magnetization down to 5 K, whereas the blocking of magnetization dominates at lower temperatures as the particle quantity increases in the polymer. We examine such magnetic behaviour in terms of the competitive magnetic ordering between core and surface spins of nanoparticles, taking into account the effect of inter-particle (dipole-dipole) interactions on nanoparticle magnetic dynamics.

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Interaction and size effects in magnetic nanoparticles

Cited by 107 publications

References 23 publications

Magnetic Interaction in FeCo Alloy Nanotube Array

Magnetic Interaction in FeCo Alloy Nanotube Array

The Effect of Gelation on the Apparent Magnetism of ZnFe2O4 Sol-Gel Systems

Magnetic response of NiFe2O4 nanoparticles in polymer matrix

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