Detailed magnetic characteristics of cobalt ferrite (CoxFe3−xO4) nanoparticles synthesized in the presence of PVP surfactant

The purpose of this study is to provide systematic information through micromagnetic simulations related to the impact of particle size on the magnetic characteristics of Cobalt-ferrite MNP. The micromagnetic computations performed were based on LLG equation. The MNPs sample was simulated in the form of a rectangular parallelepiped with a thickness of 20 nm and square surface with lateral length varies from 10 to 80 nm at an interval of 10 nm. The results of this study indicate that the size changes in Cobalt-ferrite MNP have a significant impact on various magnetic properties, such as the magnitude of the barrier energy, coercive and nucleation fields, magnetization rate, magnetization curve profile, and magnetization mode.Cobalt-ferrite MNP with a size of 10 nm shows a single domain with a relatively short magnetization reversal time and high coercive field.

Download Full-text

Dielectric and Magnetic Properties of Sintered Cobalt Ferrite Derived from Nanocrystalline Powders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.726 ◽

2012 ◽

Vol 476-478 ◽

pp. 726-729 ◽

Cited By ~ 1

Author(s):

Liang Neng Wu ◽

Li Zhen Jiang ◽

Fang Yu Hong

Keyword(s):

Dielectric Constant ◽

Magnetic Properties ◽

Hysteresis Loop ◽

Loss Tangent ◽

Room Temperature ◽

Cobalt Ferrite ◽

Relative Dielectric Constant ◽

Nanocrystalline Powders ◽

Magnetic Characteristics ◽

Dielectric Constant And Loss

A kind of Cobalt ferrite ceramics were successfully prepared by using nanocrystalline powders synthesized by citrate gel method. The relative dielectric constant and loss tangent of the ceramic as a function of frequency (100 Hz - 1 MHz) was investigated at room temperature. Both of them decrease with increase in frequency showing dispersion. Hysteresis loop magnetization was measured and the ceramic show good magnetic characteristics at room temperature.

Download Full-text

Synthesis, Characterization, and Magnetic Behavior of Cobalt-Ferrite Nanoparticles under Variant Temperature Conditions

Физика твердого тела ◽

10.21883/ftt.2021.04.50746.pss109 ◽

2021 ◽

Vol 63 (4) ◽

pp. 513

Author(s):

M.A. Alotaibi ◽

I. Ud Din ◽

A.I. Alharthi ◽

P. Ahmad ◽

A. Naeem ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Cobalt Ferrite ◽

Analytical Techniques ◽

Magnetic Behavior ◽

Ferrite Nanoparticles ◽

Magnetic Characteristics ◽

X Ray ◽

Synthesis Of Nanoparticles ◽

Cobalt Ferrite Nanoparticles ◽

Morphological Studies

Wet chemical method was applied for the synthesis of cobalt-ferrite nanoparticles. The physicochemical properties were investigated by number of analytical techniques. TGA revealed the thermal stability of synthesized cobalt-ferrite nanoparticles. X-ray diffraction studies displayed the nanoparticles crystalline nature. Structure of cobalt-ferrite nanoparticles was confirmed via infrared spectroscopy by manifesting Co and Fe ions absorption peaks. Morphological studies showed synthesis of nanoparticles of cobalt-ferrite by employing field emissions scanning electron microscopy. The magnetic properties of cobalt-ferrite nanoparticles were investigated by vibrating sample magnetometer (VSM). The X-ray photoelectron spectroscopy studies confirmed the synthesis of cobalt-ferrite by displaying the oxidation of Co as Co2+ and Fe as Fe3+, respectively. The VSM results revealed that the magnetic characteristics of cobalt-ferrite nanoparticles were completely changed by the variation of temperature. Keywords: ferrite nanoparticles, VSM, temperature effect, magneton number, anisotropy constant.

Download Full-text

The Effect of Temperature on the Viscosity of Cobalt Ferrite Nanofluids

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.g5281.059720 ◽

2020 ◽

Vol 9 (7) ◽

pp. 796-800

Keyword(s):

Magnetic Field ◽

Shear Rate ◽

Temperature Dependence ◽

Particle Concentration ◽

Cobalt Ferrite ◽

Precipitation Method ◽

Effect Of Temperature ◽

Magnetic Characteristics ◽

Essential Property ◽

Gravimetric Analysis

The temperature dependence of viscosity is an essential property of the magnetic fluids applied for heat transfer systems. This property was considered in our work for Cobalt ferrite nanofluids - one of the most explored magnetic materials recently by their improved magnetic characteristics. Cobalt ferrite nanoparticles (CFNPs) were prepared by the co-precipitation method. The characterization of the synthesized particles was analyzed by various techniques such as X-ray diffraction, transmission electron microscopy, vibrating sample magnetometry, and thermal gravimetric analysis. The effect of temperature on the viscosity of Cobalt ferrite nanofluids was investigated. Experiments were carried out in the range of particle concentration from 0.5 to 7 % without and with a magnetic field application. The dynamic viscosities of these nanofluids were measured as the shear rate and temperature dependence under the magnetic field of different intensities, using a standard rotating rheometer. The cobalt ferrite fluids exhibit a yield shear-thinning behavior at all the temperatures from 25 to 55 oC. The experimental results show that the viscosity decreases when the temperature is increased. This variation is exponentially and dependent on the shear rate. The temperature-dependent viscosity is not influenced significantly by either particle concentration or magnetic field. From the obtained results, the Arrhenius equation for the viscosity-temperature relationship is applied

Download Full-text