The Relation of Crystallite Size and Ni2+ Content to Ferromagnetic Resonance Properties of Nano Nickel Ferrites

Lafta, Sadeq H.

doi:10.4283/jmag.2017.22.2.188

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…As a net influence of phases, the whole sample possesses ferromagnetic behavior, which is weaker. Upon size reduction, the coercive field decreases . The increase in other phases such as CuBi 2 O 4 , Bi 25 FeO 39 , and Bi 2 Fe 4 O 9 in the sample affects the ferromagnetic nature, making it weaker by increasing the number of uncompensated spins because M r was gradually decreasing with increasing Cu addition, as shown in Figure c.…”

Section: Resultsmentioning

confidence: 92%

“…Upon size reduction, the coercive field decreases. 30 The increase in other phases such as CuBi 2 O 4 , Bi 25 FeO 39 , and Bi 2 Fe 4 O 9 in the sample affects the ferromagnetic nature, making it weaker by increasing the number of uncompensated spins because M r was gradually decreasing with increasing Cu addition, as shown in Figure 5c. Table 3 contains the various values of H c , M r , and M s .…”

Section: Resultsmentioning

confidence: 96%

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Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO₃

Aishwarya,

Maruthasalamoorthy,

Thenmozhi

et al. 2024

ACS Omega

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In this study, bismuth ferrite (BFO) and copper-added BFO were synthesized using the coprecipitation method. The incorporation of copper into the BFO lattice led to a reduction in the phase percentage of BFO due to the early formation of CuBi 2 O 4 . X-ray diffraction analysis revealed a decrease in crystallite size up to 0.1 CBFO, followed by an increase. This reduction in crystallite size causes an imbalance between the spins of the sublattices, resulting in an antiferromagnetic core/ferromagnetic shell (AC/FS) structure. The uncompensated spins generated by the decreasing crystallite size weaken the ferromagnetic properties with the addition of Cu. Additionally, the reduction in crystallite size leads to decreased electrical conductivity due to carrier scattering, with the maximum conductivity observed in BFO attributed to its volatilization. The Seebeck coefficient enhancement in 0.1 and 0.15 CBFO indicates an energy filtering effect caused by barriers at the phase boundaries. The introduction of Cu into the BFO matrix also results in reduced lattice thermal conductivity due to active centers for phonon scattering created by Cu-induced defects. The lowest lattice thermal conductivity was observed in 0.1 CBFO, which is attributed to the significant reduction in crystallite size and the presence of phase boundaries enhancing phonon scattering. The highest thermoelectric figure of merit (zT) was achieved in thermally unstable BFO due to Bi 3+ volatilization, which was mitigated by the formation of CuBi 2 O 4 in CBFO.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 96%

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO₃

Aishwarya,

Maruthasalamoorthy,

Thenmozhi

et al. 2024

ACS Omega

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“…The M s value is low compared to bulk Magnetite because of the effect of lowering M s with the reduction of the particle size as in [Eq. 11]: [45] 11

\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {M}_{sn}={M}_{sb}[1-{\rm \ }(\beta /D\left)\right]{\rm \ }\hfill\cr}}

…”

Section: Resultsmentioning

confidence: 99%

“…The M s value is low compared to bulk Magnetite because of the effect of lowering M s with the reduction of the particle size as in [Eq. 11]: [45] M sn ¼ M sb ½1 À ðb=DÞ� (11) Pyrrhotite -20 Ferromagnetic [42] Pyrite --Diamagnetic [43] FeO 2 --Paramagnetic [44] ChemistrySelect 2023, 8, e202301568 (6 of 11) © 2023 Wiley-VCH GmbH…”

Section: Antioxidant Activitymentioning

confidence: 99%

Effect of Hydrothermal Reaction Time on Structure, Magnetic, and Biological Properties of Iron Sulfide Nanoparticles

Naser,

Lafta,

Hashim

2023

ChemistrySelect

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Three samples of Fe−S were prepared with different hydrothermal periods (6, 12, and 18 h). X‐ray diffraction (XRD) test showed that the first produced sample contained 42.3 wt % of magnetite, 35 wt % of greigite, and 22.7 wt % of pyrite phases. The same phases were formed during the second period but with different wt % ratios. The greigite increased to 67.8 wt % by the third period, while the magnetite and pyrite phases vanished and were associated with a low ratio of the presence of pyrrhotite and FeO2. Scanning electron microscope (SEM) images confirmed the formation of the nanoparticles. The increase in the hydrothermal time produced a reduction in the saturation magnetization (39.8 to 9.1) emu/g and the remanence magnetization (8 to 2.4) emu/g, and increasing in the coercivity. To assess the viability of Michigan Cancer Foundation‐7 (MCF‐7) and hemolytic disease of the fetus and newborn (HdFn) cells, a colorimetric assay for assessing cell metabolic activity (MTT) was applied to the third sample. The outcome verified iron sulfide‘s cytocompatibility against HdFn cells even at high concentrations and good anticancer activity against MCF‐7 cell lines. The result of the DPPH test confirmed that the third sample had antioxidant activity equivalent to that of ascorbic acid.

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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

Self Cite

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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 Relation of Crystallite Size and Ni2+ Content to Ferromagnetic Resonance Properties of Nano Nickel Ferrites

Cited by 14 publications

References 2 publications

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO₃

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO₃

Effect of Hydrothermal Reaction Time on Structure, Magnetic, and Biological Properties of Iron Sulfide Nanoparticles

Fabrication of a Simple Computerized High Power Supply for Magnetic Measurements

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The Relation of Crystallite Size and Ni2+ Content to Ferromagnetic Resonance Properties of Nano Nickel Ferrites

Cited by 14 publications

References 2 publications

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO3

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO3

Effect of Hydrothermal Reaction Time on Structure, Magnetic, and Biological Properties of Iron Sulfide Nanoparticles

Fabrication of a Simple Computerized High Power Supply for Magnetic Measurements

Contact Info

Product

Resources

About

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO₃

Impact of Crystallite Size and Phase Boundaries on Magnetic and Thermoelectric Properties of Cu-Added BiFeO₃