Preparation and characterization of cobalt ferrite by the polymerized complex method

Montemayor, Sagrario M.; Garcı́a-Cerda, L.A.; Torres-Lubián, Román

doi:10.1016/j.matlet.2004.12.004

Cited by 63 publications

(24 citation statements)

References 12 publications

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“…Cobalt [31] and neodymium [32] were shown to improve the magnetic properties of iron oxides. In addition, doping of Eu ions into the Gd 2 O 3 matrix gives unique luminescent properties [33,34].…”

Section: Introductionmentioning

confidence: 99%

Magnetic/luminescent core/shell particles synthesized by spray pyrolysis and their application in immunoassays with internal standard

Dosev¹,

Nichkova²,

Dumas³

et al. 2007

Nanotechnology

103

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Many types of fluorescent nanoparticles have been investigated as alternatives to conventional organic dyes in biochemistry; magnetic beads also have a long history of biological applications. In this work we apply flame spray pyrolysis in order to engineer a novel type of nanoparticle that has both luminescent and magnetic properties. The particles have magnetic cores of iron oxide doped with cobalt and neodymium and luminescent shells of europium-doped gadolinium oxide (Eu:Gd 2 O 3 ). Measurements by vibrating sample magnetometry showed an overall paramagnetic response of these composite particles. Luminescence spectroscopy showed spectra typical of the Eu ion in a Gd 2 O 3 host-a narrow emission peak centred near 615 nm. Our synthesis method offers a low-cost, high-rate synthesis route that enables a wide range of biological applications of magnetic/ luminescent core/shell particles. Using these particles we demonstrate a novel immunoassay format with internal luminescent calibration for more precise measurements.

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Section: Introductionmentioning

confidence: 99%

Magnetic/luminescent core/shell particles synthesized by spray pyrolysis and their application in immunoassays with internal standard

Dosev¹,

Nichkova²,

Dumas³

et al. 2007

Nanotechnology

103

View full text Add to dashboard Cite

show abstract

“…The main peaks in the pattern could be attributed to the ferrite spinel and the lead-free ferroelectric perovskite NBT phase. 18,20 The unit cell parameters calculated for the rhombohedral NBT are a ¼ 3.8762 6 0.0003 Å ; a ¼ 89.9 and for Cubic CFO are a ¼ 8.3615 6 0.0002 Å . No other phase was detected.…”

Section: Methodsmentioning

confidence: 99%

“…may be different from that of its bulk form, which can affect the coercive field. 20,22 Figure 4 shows room temperature ferromagnetic resonance (FMR) results obtained on the 70%NBT-30%CFO composite at 9.8 GHz frequency. The external magnetic field is applied parallel to the large surface of the composite samples, and is swept between 2000 Oe to 14000 Oe with superimposed electric field.…”

Section: Methodsmentioning

confidence: 99%

“…17,18 Cobalt ferrite (CFO) is a hard magnetic material characterized by high coercivity, moderate saturation magnetization, good chemical stability, significant hardness, and large magnetostriction. 19,20 Hence, the lead-free particulate composite of NBT/ CFO is a good candidate for the study of electric field tunable magnetic properties. However, there has been no experimental report, so far, on electrostatically tunable ferromagnetic resonance (FMR) field properties on multiferroic particulate composites.…”

Section: Introductionmentioning

confidence: 99%

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Electric field tunable magnetic properties of lead-free Na0.5Bi0.5TiO3/CoFe2O4 multiferroic composites

Babu

Min

Małkiński

2011

Journal of Applied Physics

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Lead-free multiferroic particulate composites of Na 0.5 Bi 0.5 TiO 3 (NBT) and CoFe 2 O 4 (CFO) have been synthesized by solid-state sintering method. A systematic study of structural, magnetic and magnetoelectric (ME) properties is undertaken. Structural and morphology studies carried out by x-ray diffraction and field emission scanning electron microscopy indicate formation of single phase for parent phases and presence of both phases in the composites. Magnetic properties are investigated using vibrating sample magnetometer and ferromagnetic resonance (FMR) measurements at room temperature. Strong ME coupling is demonstrated in NBT-CFO 70-30 mol% composite by an electrostatically tunable FMR field shift up to 428 Oe (at E ¼ 3.9 kV/cm), which increases to a large value of 640 Oe at E ¼ 6.8 kV/cm. Furthermore, these lead-free multiferroic composites exhibiting electrostatically induced magnetic resonance field at microwave frequencies provide great opportunities for electric field tunable microwave devices.

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“…[1][2][3][4][5] In order to characterize the magnetization of these particles and monitor their behavior, a sensitive detection method is required. Several techniques have been developed for detecting weak magnetic fields, for example, superconducting quantum interference devices ͑SQUIDs͒, 6,7 giant magnetoresistive ͑GMR͒ sensors, 8,9 vibrating sample magnetometers, 10,11 and atomic magnetometers. 12 Magnetic resonance imaging ͑MRI͒ can also be used for diagnostics with magnetic microparticles.…”

mentioning

confidence: 99%

Application of atomic magnetometry in magnetic particle detection

Donaldson

Pines

et al. 2006

Applied Physics Letters

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The authors demonstrate the detection of magnetic particles carried by water in a continuous flow using an atomic magnetic gradiometer. Studies on three types of magnetic particles are presented: a single cobalt particle ͑diameter ϳ150 m, multidomain͒, a suspension of superparamagnetic magnetite particles ͑diameter ϳ1 m͒, and ferromagnetic cobalt nanoparticles ͑diameter ϳ10 nm͒. Estimated detection limits are 20 m diameter for a single cobalt particle at a water flow rate of 30 ml/ min, 5 ϫ 10 3 magnetite particles at 160 ml/ min, and 50 pl for the ferromagnetic fluid of cobalt nanoparticles at 130 ml/ min. Possible applications of their method are discussed.

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Preparation and characterization of cobalt ferrite by the polymerized complex method

Cited by 63 publications

References 12 publications

Magnetic/luminescent core/shell particles synthesized by spray pyrolysis and their application in immunoassays with internal standard

Magnetic/luminescent core/shell particles synthesized by spray pyrolysis and their application in immunoassays with internal standard

Electric field tunable magnetic properties of lead-free Na0.5Bi0.5TiO3/CoFe2O4 multiferroic composites

Application of atomic magnetometry in magnetic particle detection

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