The FMR Behaviour of Li–Ni Ferrite Prepared by Hydrothermal Method

Al‐Shakarchi, Emad K.; Lafta, Sadeq H.; Musa, Ali M.; Farle, Michael; Salikhov, Ruslan

doi:10.1007/s10948-017-4058-9

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…This indicates that the three samples consist of the same elements, but the difference is in the intensities of the peaks. This may indicate a change in the concentration of the elements from one sample to another, 62 which is in agreement with XRD results.…”

Section: Samplesupporting

confidence: 86%

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: Samplesupporting

confidence: 86%

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Naser,

Lafta,

Hashim

2024

Biotech and App Biochem

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“…We can conclude that rather than Gilbert damping there are extrinsic relaxation mechanisms predominant in this case, as a strong interparticle interaction caused by nanoparticle aggregation, so that apart from dipolar interactions appear intracluster exchange, which leads to the observed deformed resonance curve [31,32]. The values of linewidth are around 700 Oe that means that, unless is clearly higher than obtained in single crystals [18], is lower than obtained for other authors in similar nanoparticle systems [27,29,30], so that the fabrication method produce particles with lower magnetic inhomogeneity.…”

Section: Microwave Characterizationmentioning

confidence: 52%

“…The high frequency edge of the resonance is broader and exhibits a lower intensity than the initial one. The inhomogeneous broadening behaviour is common in nanoparticle systems [26,27] due to the existence of higher order spin-wave modes, that can be originated from different ways: interaggregate dipolar interaction due to large residual strains, porosity or inhomogeneities in the sample, random distributions of anisotropy axis [25], as well as increased losses caused by hopping of conduction electrons that enhances the relaxation, when the particle size is small compared with the skin depth [27]. In the Figure 8a, we show the broadening factor calculated as the ratio among minimum and maximum in the derivative of the absorption curve.…”

Section: Microwave Characterizationmentioning

confidence: 99%

Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles

Hernández-Gómez

Graça

Muñoz

2018

Journal of Alloys and Compounds

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Lithium ferrites are well known materials due to its numerous technological applications especially in microwave devices. Lithium ferrite nanoparticles were prepared by sol-gel technique by means of Pechini method, and then annealed at different temperatures in 250-1000º C range. XRD confirms spinel formation with particles sizes in 15-700 nm range, with increased size with annealing temperature, whereas FTIR and Raman measurement confirm that single phase lithium ferrite with ordered cationic structure is obtained. Microwave magnetoabsorption data of the annealed lithium ferrite nanoparticles were obtained with a broadband system based on a network analyzer that operates up to 8.5 GHz. At fields up to 200 mT we can observe a broad absorption peak that shifts to higher frequencies with magnetic field according to ferromagnetic resonance theory. The amplitude of absorption, up to 85 %, together with the frequency width of about 5.5 GHz makes this material suitable as wave absorber. FMR parameters like resonance field, linewidth and broadening are analyzed in order to obtain the characteristic parameters and analyze the microwave behaviour.

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“…Xcos has advantages like simple and easy block connection, availability of different loop functions and the possibility to program a whole algorithm by completely utilizing Xcos blocks [19]. Magnetic properties are usually measured by two essential tests, magnetization-field (M-H) test (or magnetic hysteresis loop), isothermal caloric test, and ferromagnetic resonance (FMR) test [20,21]. The magnetization-Field test requires a magnetic field value to be increased linearly with time from zero to a maximum value and then drops to zero in a linear way too.…”

Section: Scilab Softwarementioning

confidence: 99%

Fabrication of a Simple Computerized High Power Supply for Magnetic Measurements

Lafta,

Albahrani

2024

International Journal of Electrical Engineering and Computer Science

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A High current power supply was built and controlled by a personal computer using a simple design and a low-cost components for magnetic measurement applications. The design depends on the Arduino Uno board and Scilab software. Three Scilab block diagrams were given to simulate three magnetic tests, which are constant field block diagram (single field value), increasing and decreasing fields for FMR and magnetocaloric tests, and field for hysteresis loop test. Each Scilab block diagram contained different xcos blocks to control the Arduino output voltage and other blocks to sense, read, and calibrate the field value. This control was done via controlling pulse width modulation in the range (0-255). The output of each block diagram was simulated by measuring its variation with time using a cscope block display. The Arduino signal was amplified by a simple electronic circuit that involved two stages, BUL680 transistor as the first stage. Two high-power transistors EVK71-050 or Q50z were used in the second stage. The output of 107V-39.8A from the first one and 108V- 39.7A from the second one produces a magnetic field of about 30000Oe. The linearity between the current and the field value is better for Q50z due to the variation of α with the wide variation of collector current.

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The FMR Behaviour of Li–Ni Ferrite Prepared by Hydrothermal Method

Cited by 7 publications

References 22 publications

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Antioxidant activity and cytotoxicity of greigite nanoparticles synthesized by hydrothermal technique

Synthesis, structural characterization and broadband ferromagnetic resonance in Li ferrite nanoparticles

Fabrication of a Simple Computerized High Power Supply for Magnetic Measurements

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