Superparamagnetic behavior of MnxNi1−xFe2O4 spinel nanoferrites

Abdallah, H. M. I.; Moyo, T.

doi:10.1016/j.jmmm.2014.02.077

Cited by 33 publications

(12 citation statements)

References 21 publications

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“…The observed M S values are in good agreement with the cation distribution theory and Neel's molecular field model [1]. The lower values of M S for some of the NCs can be explained by the effect of the spin canting in the frame of the non-colinear Yafet-Kittel model in the presence of Jahn-Teller cations [8].…”

Section: Resultssupporting

confidence: 80%

“…Ni-Mn ferrites show interesting magnetic properties which recommend them to be used as hard or soft magnets and for high-frequency applications. The ferrite structure and magnetic properties are sensitive to synthesis methods, additive substitutions and calcination process [8]. By adjusting the Mn to Ni ratio in the ferrite, the magnetic properties of the ferrite can be controlled [3].…”

Section: Introductionmentioning

confidence: 99%

“…The presence of Mn 2+ ions in Ni ferrites changes their structural, magnetic, electrical and dielectric properties [9]. Surface spins, spin canting and reduction of particle sizes also influence the magnetic properties [8].…”

Section: Introductionmentioning

confidence: 99%

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Sol-Gel Synthesis, Structure, Morphology and Magnetic Properties of Ni0.6Mn0.4Fe2O4 Nanoparticles Embedded in SiO2 Matrix

et al. 2021

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The structure, morphology and magnetic properties of (Ni0.6Mn0.4Fe2O4)α(SiO2)100−α (α = 0–100%) nanocomposites (NCs) produced by sol-gel synthesis were investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM) and vibrating sample magnetometry (VSM). At low calcination temperatures (300 °C), poorly crystallized Ni0.6Mn0.4Fe2O4, while at high calcination temperatures, well-crystallized Ni0.6Mn0.4Fe2O4 was obtained along with α-Fe2O3, quartz, cristobalite or iron silicate secondary phase, depending on the Ni0.6Mn0.4Fe2O4 content in the NCs. The average crystallite size increases from 2.6 to 74.5 nm with the increase of calcination temperature and ferrite content embedded in the SiO2 matrix. The saturation magnetization (Ms) enhances from 2.5 to 80.5 emu/g, the remanent magnetization (MR) from 0.68 to 12.6 emu/g and the coercive field (HC) from 126 to 260 Oe with increasing of Ni0.6Mn0.4Fe2O4 content in the NCs. The SiO2 matrix has a diamagnetic behavior with a minor ferromagnetic fraction, Ni0.6Mn0.4Fe2O4 embedded in SiO2 matrix displays superparamagnetic behavior, while unembedded Ni0.6Mn0.4Fe2O4 has a high-quality ferromagnetic behavior.

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Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Sol-Gel Synthesis, Structure, Morphology and Magnetic Properties of Ni0.6Mn0.4Fe2O4 Nanoparticles Embedded in SiO2 Matrix

et al. 2021

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“…The value of magnetic coercivity of the obtained MgFe 2 O 4 nanoparticles is smaller than that of the ZnFe 2 O 4 (Hc = 67.3 Oe) and MnFe 2 O 4 (Hc = 44.5 Oe) nanoparticles with sizes below 10 nm reported by Sabale et al [32]. Superparamagnetic behavior can occur in nano-sized ferromagnetic and ferrimagnetic nanoparticles with a single domain because of weak interaction and thermal fluctuations of the spins of ferrite nanoparticles [33]. Pileni has described the thermal fluctuation effect on flips of spins between the easy magnetization axes, which lead to very small or negligible coercivity and remanence [34].…”

Section: Resultsmentioning

confidence: 99%

Hydrothermally Synthesized Mg-Based Spinel Nanoferrites: Phase Formation and Study on Magnetic Features and Microwave Characteristics

2018

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Three kinds of magnesium-based spinel nanoferrites with the chemical formulas of MgFe2O4 (Mg ferrite), Mg0.9Mn0.1Fe2O4 (Mg-Mn ferrite), and Mg0.9Mn0.1In0.1Fe1.9O4 (Mg-Mn-In ferrite) were synthesized by hydrothermal route. We report the composition-dependent magnetic parameters and microwave properties of Mg-based ferrite nanoparticles. XRD results revealed that the Mg-based ferrite nanoparticles exhibited a cubic spinel structure and had an average nanocrystallite size in the range of 5.8–2.6 nm. Raman spectroscopy analysis confirmed the formation of cubic-spinel phase Mg-based nanoferrites. The room-temperature magnetization measurements indicated that the Mg ferrite nanoparticles had superparamagnetic behavior; whereas the Mg-Mn and Mg-Mn-In ferrite nanoparticles exhibited a paramagnetic nature. The microwave properties of obtained ferrite nanoparticles were studied by alternating current (AC) magnetic susceptibility measurement and electron paramagnetic resonance (EPR) spectroscopy. It was found that the un-substituted Mg ferrite sample exhibited microwave characteristics better than those of the Mn substituted and Mn-In co-substituted Mg ferrite samples.

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“…Depending on the characteristics of the constituent ions of the composition formula, these oxide materials can exhibit multiple physical properties. 2 In this way, electrical transport properties ranging from semiconducting character 3 through insulator-metal transitions and superconducting response, 4 as well as paramagnetic, 5 superparamagnetic, 6 antiferromagnetic, 7 ferrimagnetic, 8,9 ferromagnetic, 10 and magnetoelectric 11 behaviors can be obtained. The adjustment of physical properties in this family of materials results from compositional and morphological modifications, making possible the design of devices based on the simultaneous control of electric charge transport currents and spin currents, with technological applications corresponding to the field of spintronics.…”

Section: Introductionmentioning

confidence: 98%

Weak Ferromagnetism in the FeCr2O4 Semiconductor Spinel with Half-Metallic Feature in the Ground State

Cerón

Téllez

2021

J. Electron. Mater.

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Materials with multifunctional properties are currently being studied for countless technological applications. In the present work, an experimental and theoretical study of the iron-chromite spinel FeCr 2 O 4 produced by the solid-state reaction technique is reported. Structural analysis from x-ray diffraction experiments revealed the crystallization of the material into a cubic structure and morphological and compositional studies showed the granular character, with nanometric and micrometric dimensions whose compositions are as expected from its chemical stoichiometry. Optical characterization reveals semiconducting behavior with bandgap 1.52 eV and the magnetic response shows weak ferromagnetic character at room temperature. The density of electronic states in the ground state evidences characteristic semiconducting for one spin polarization and conducting for the other close to the Fermi level, which is compatible with a half-metallic behavior with magnetic moment of 2.0 µ B per unit cell.

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Superparamagnetic behavior of MnxNi1−xFe2O4 spinel nanoferrites

Cited by 33 publications

References 21 publications

Sol-Gel Synthesis, Structure, Morphology and Magnetic Properties of Ni0.6Mn0.4Fe2O4 Nanoparticles Embedded in SiO2 Matrix

Sol-Gel Synthesis, Structure, Morphology and Magnetic Properties of Ni0.6Mn0.4Fe2O4 Nanoparticles Embedded in SiO2 Matrix

Hydrothermally Synthesized Mg-Based Spinel Nanoferrites: Phase Formation and Study on Magnetic Features and Microwave Characteristics

Weak Ferromagnetism in the FeCr2O4 Semiconductor Spinel with Half-Metallic Feature in the Ground State

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