Temperature dependence of magnetic properties of NiFe2O4 nanoparticles embeded in SiO2 matrix

Mitra, Subrata; Mandal, Kalyan; Kumar, Pankaj

doi:10.1016/j.jmmm.2006.03.024

Cited by 63 publications

(44 citation statements)

References 17 publications

(26 reference statements)

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“…[ 55,61 ] But the difference in the magnitude of the anisotropy constants observed among these compounds is due to the large difference of their density (8.90 g cm −3 , 5.38 g cm −3 and 2.28 g cm −3 respectively for Ni, Ni II Fe III 2 O 4 and CsNi II Cr III (CN) 6 ). [ 62 ] The comparison of the local magneto-crystalline anisotropy would be more relevant.…”

Section: Origin Of the Magnetic Anisotropymentioning

confidence: 99%

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Prado

Mazérat

Rivière

et al. 2014

Adv Funct Materials

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5402www.MaterialsViews.com wileyonlinelibrary.com their post-modifi cation. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] We have reported an alternative surfactant-free synthesis that led, by adjusting the physico-chemical para meters, to the formation of stable colloidal aqueous solutions of nanocrystals with a narrow size distribution. [ 25,26 ] This stability originates from the negatively charged surface and has been exploited to set a versatile simple synthetic route for core-multishell heterostructured nanoparticles. [ 17 ] The method is based on a seed-mediated growth in solution of a shell on the as-obtained colloids either using the same PBA coordination network or another one. [ 17,[25][26][27][28][29] It was quite remarkable to observe that the size distribution of the resulting objects was of the order of 10%. Then, knowing that the cell parameter of the PBA networks is about 1 nm, which corresponds to two atomic layers ( Figure 1 ), such a size distribution corresponds to a control during the growth in solution over one monolayer. [ 17 ] The control of the monodispersity and the absence of stabilizing agents in these anionic objects allowed their organization in thin fi lms, [ 30,31 ] their use for surface nanopatterning, [ 32 ] and is essential for the analysis of their magnetic behaviour (see below).In a fi rst communication, [ 27 ] we have reported a series of cubic-like coordination nanoparticles of the ferromagnetic network CsNi II Cr III (CN) 6 ( T C (bulk) = 90 K) with sizes ranging from 6 to 30 nm and a narrow distribution (10-20%), using the seedmediated growth process. The study of the magnetic properties of these particles dispersed in a polymer (polyvinylpyrrolidone, PVP, for instance) allowed us determining experimentally the single domain limit size that was found to be around 15-16 nm. Below this size, as expected, a uniform reversal of the magnetization was observed. These results were in line with a Néel-Brown thermal activated magnetization reversal process with a relaxation governed by an anisotropy energy proportional to the volume of the particles, with no detectable surface anisotropy effect. [33][34][35] However, upon decreasing their size surface effects may become dominant and contribute greatly to the magnetic anisotropy of nanoparticles. [ 36,37 ] As evidenced in thin fi lms and nanoparticles, surface anisotropy constant is found higher by many orders of magnitude than that of the bulk. [ 1,38,39 ] Specifi cally in PBA nanoparticles, the role of surface anisotropy cannot be neglected because the coordination sphere of the divalent metal ions (Ni II ions here) present on the surface can be different from those belonging to the

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Section: Origin Of the Magnetic Anisotropymentioning

confidence: 99%

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Prado

Mazérat

Rivière

et al. 2014

Adv Funct Materials

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“…Considering the log-normal distribution function, P(y) for particle size distribution, the average magnetic moment of the sample of mass m and containing N particles of different sizes could be written as [15,18,19]: For an assembly of monodispersed, non-interacting, ferro-or ferrimagnetically ordered single-domain particles, the temperature dependence of coercivity H c (T) can be expressed as [20]:…”

Section: Sample Namementioning

confidence: 99%

Preparation and study of NiFe2O4/SiO2 core–shell nanocomposites

Chaudhuri

Mandal

2009

Journal of Alloys and Compounds

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“…All the samples show the hysteresis loops in the filed dependence magnetization measurement indicating the ferromagnetic behavior. At [9,17,18]. This is due to the soft nature of the ferrite nanoparticles.…”

Section: Epr and Magnetization Studiesmentioning

confidence: 99%

Mössbauer and magnetic studies on nanocrystalline NiFe2O4 particles prepared by ethylene glycol route

Umare

Ningthoujam

Sharma³

et al. 2008

Hyperfine Interact

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NiFe 2 O 4 nanoparticles have been synthesized by co-precipitation method at 145 • C in N 2 atmosphere using ethylene glycol as solvent and capping agent. This gives the promising synthesis route for nanoparticles at low temperature. The as-synthesized NiFe 2 O 4 is subsequently heated at 400 • C, 500 • C, 700 • C and 800 • C. Crystallite size increases with the heat treatment temperature. The heat treatment temperature has direct effect on the electron paramagnetic resonance and intrinsic magnetic properties. The room temperature Mössbauer spectrum of the 800 • C heated sample shows the two sextets pattern indicating that the sample is ferrimagnetic and Fe 3+ ions occupy both tetrahedral and octahedral sites of spinel structure.

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Temperature dependence of magnetic properties of NiFe2O4 nanoparticles embeded in SiO2 matrix

Cited by 63 publications

References 17 publications

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Preparation and study of NiFe2O4/SiO2 core–shell nanocomposites

Mössbauer and magnetic studies on nanocrystalline NiFe2O4 particles prepared by ethylene glycol route

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Temperature dependence of magnetic properties of NiFe2O4 nanoparticles embeded in SiO2 matrix

Cited by 63 publications

References 17 publications

Magnetization Reversal in CsNiIICrIII(CN)6 Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Magnetization Reversal in CsNiIICrIII(CN)6 Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Preparation and study of NiFe2O4/SiO2 core–shell nanocomposites

Mössbauer and magnetic studies on nanocrystalline NiFe2O4 particles prepared by ethylene glycol route

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Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects