Broadband ferromagnetic resonance of non-stoichiometric nano Nickle ferrite with different Ni<sup>2+</sup>content

Lafta, Sadeq H.

doi:10.1088/2053-1591/aafb80

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…73 A previous study found a comparable value of H c . 74,75 The remanence magnetization Mr is small 29 compared to comparable iron oxides, 76 which in turn affects the squareness ratio (Mr/Ms) value as given in Table 2. This may be related to the domain structure and particle size, where the smaller particles produce higher remanence, 75 which in turn produces a lower squareness ratio due to the associated decrease in the Ms.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Naser,

Lafta,

Hashim

2024

Biotech and App Biochem

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The effects of 180, 210, and 230°C reaction temperatures on the structural and magnetic properties of synthesized iron sulfide nanoparticles were studied. The Rietveld refinement analysis result of the X‐ray diffraction data indicated that greigite was the dominant phase in all samples. The sample was prepared at 210°C for 18 h and had a greater wt% ratio of the greigite phase. The crystallite and particle sizes increased with increasing reaction temperatures. Scanning electron microscope images confirmed the presence of aggregation of synthesized rod‐shaped nanoparticles. The magnetic hysteresis curves of all samples showed ferromagnetic behavior at room temperature. The magnetic saturation of three samples increases with increased reaction temperature, but the coercive force has the opposite behavior. Antioxidant activity and cytotoxicity of the sample synthesized at 210°C were investigated. This sample killed cancer cells at relatively moderate and high concentrations with high viability of normal cells, demonstrating the sample's suitability for use in killing cancer cells while avoiding normal cells.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Naser,

Lafta,

Hashim

2024

Biotech and App Biochem

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Comparing the role of NaOH and NH4OH on structural and magnetic properties of spinel Ba ferrite synthesized by autocombustion method

Abdel-Mohsen

Lafta

Hashim

2022

J. Phys.: Conf. Ser.

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A comparison between using NaOH and NH4OH for synthesizing nano Ni0.1Ba0.9Fe2O4 via autocombustion method was done. During the preparation of the two samples, metal salts were dissolved in distilled water and then the two chemical bases were added separately till pH reaches 7.5. The samples were fired at 600°C for 2h. X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning electron microscope (SEM), and vibrating sample magnetometer (VSM) tests were utilized to characterize the samples. XRD test showed a spinel cubic pattern for the two samples and their lattice constants were comparable to that in literature. The calculated crystallite sizes for the two samples were so approximated. SEM images showed a greater average spherical particle size for the prepared sample by NH4OH. FTIR analysis illustrated some reaction residuals in the samples prepared by NaOH. The sample prepared by NH4OH showed higher magnetization saturation and low coercivity. Depending on particle size and squarness ratio, the sample prepared by NaOH is more super paramagnetic compared to the other.

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Hydrothermal Temperature Influence on Magnetic and FMR Properties of Hematite Nanoparticles

Lafta

2022

Surf. Rev. Lett.

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Investigation of the role of hydrothermal temperature on hematite nanoparticles structural, magnetic, and ferromagnetic resonance (FMR) properties was done. Ferric chloride and sodium hydroxide were used as the starting precursors. The hydrothermal temperature was varied in the range of 140–200∘C by a step of 20∘C. XRD, SEM, VSM, and FMR analyses were used to check the particles’ properties. The prevailing strongly phase was hematite with some small peaks related to other phases. A reduction in lattice constant and increase in the crystallite size to more than 27[Formula: see text]nm is observed. The particles’ morphology exhibited polygon particles down to spherical particles as the average particle size gets larger up to 45[Formula: see text]nm. The hysteresis loops showed unsaturated curves with rising coercivity up to 150Oe. The antiferromagnetism permeability, magnetization saturation, and dipole moment were found by Langevin fitting to the experimental hysteresis loops, where all of them have the same behavior represented by an initial drop followed by increase in their values. The FMR spectra are characterized by low intensities and low linewidths accompanied by very low blue shift in the resonance field. All samples showed Lorentzian distribution as checked by the Lorentz function. Landé [Formula: see text]-factor has values very close but less than 2 due to the effect of crystal field and particle magnetic moment variations.

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Broadband ferromagnetic resonance of non-stoichiometric nano Nickle ferrite with different Ni²⁺content

Cited by 3 publications

References 43 publications

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Comparing the role of NaOH and NH4OH on structural and magnetic properties of spinel Ba ferrite synthesized by autocombustion method

Hydrothermal Temperature Influence on Magnetic and FMR Properties of Hematite Nanoparticles

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Broadband ferromagnetic resonance of non-stoichiometric nano Nickle ferrite with different Ni2+content

Cited by 3 publications

References 43 publications

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Comparing the role of NaOH and NH4OH on structural and magnetic properties of spinel Ba ferrite synthesized by autocombustion method

Hydrothermal Temperature Influence on Magnetic and FMR Properties of Hematite Nanoparticles

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Broadband ferromagnetic resonance of non-stoichiometric nano Nickle ferrite with different Ni²⁺content