Magnetic properties of MnCr2O4 nanoparticle

Masrour, R.; Hamedoun, M.; Benyoussef, A.

doi:10.1016/j.jmmm.2009.08.051

Cited by 31 publications

(6 citation statements)

References 29 publications

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“…Predicting precisely the T C of such a composition is impossible because each substitution cannot be accounted independently. Qualitatively we can estimate the tendencies based on linear interpolation from T C of end members: MnCr 2 O 4 (45 K), Mg or ZnCr 2 O 4 (15 K), FeAl 2 O 4 (13 K), and FeV 2 O 4 (109 K) [ Klemme et al , 2000; Masrour et al , 2010; Schieber , 1967]. V 3+ and Mn 2+ substitutions (by the same amount) have a very small net effect (ΔT C of +29 K and −35 K respectively).…”

Section: Discussionmentioning

confidence: 99%

Low temperature magnetic transition of chromite in ordinary chondrites

Gattacceca

Rochette

Lagroix

et al. 2011

Geophys. Res. Lett.

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[1] We present low temperature magnetic data (thermal demagnetization, hysteresis) obtained on thirty three ordinary chondrite meteorites. A magnetic transition is observed in the 40-80 K range (average 66 K), and is interpreted as a ferrimagnetic to paramagnetic phase transition. We present quantitative analyses of changes in magnetization across the magnetic phase transition and chemical elemental analyses to argue that chromite, a common accessory mineral in meteorites, is the mineral undergoing the phase transition, and not troilite or tetrataenite as proposed in previous studies. Moreover, we observe a correlation between the measured Curie temperature and chemical composition of chromites in ordinary chondrites. Low temperature magnetic measurement are thus a sensitive indicator of chromite composition in these meteorites, and as such a possible proxy to the understanding of their thermal metamorphism.

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Section: Discussionmentioning

confidence: 99%

Low temperature magnetic transition of chromite in ordinary chondrites

Gattacceca

Rochette

Lagroix

et al. 2011

Geophys. Res. Lett.

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“…crystallize in the spinel structure, which is described by a unit cell of 32 cubic close-packed oxide anions in which the metal cations occupy 8 tetrahedral ( T d -site) and 16 octahedral sites ( O h -site). , The stoichiometry, the nature of the divalent cations, and their distribution among these two types of interstitial sites (usually summed up by the so-called “inversion degree”) are key features to modulate the magnetic properties (e.g., saturation magnetization and anisotropy) of the cubic ferrite, beyond size and shape changes. − Among these materials, cobalt ferrite (CoFe 2 O 4 ) features the highest anisotropy constant (2.9 × 10 5 J m –3 ), which makes it the sole magnetically hard phase, but for some applications, the higher toxicity of cobalt ions in comparison with others has to be taken into account. Besides the size-, − shape-, ,− and coating-tuning − approaches, cation substitution (also improperly called doping) is a well-known strategy to modulate the properties of nanostructured spinels. − The co-presence of different types of divalent cations in the structure (i.e., the production of chemically mixed ferrites) represents a successful strategy to finely tune the magnetic behavior and reduce the toxicity of the final product. , …”

Section: Introductionmentioning

confidence: 99%

Evolution of the Magnetic and Structural Properties with the Chemical Composition in Oleate-Capped Mn_xCo_1–xFe₂O₄ Nanoparticles

et al. 2021

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Understanding the complex link among composition, microstructure, and magnetic properties paves the way to the rational design of well-defined magnetic materials. In this context, the evolution of the magnetic and structural properties in a series of oleate-capped manganese-substituted cobalt ferrites (Mn x Co 1−x Fe 2 O 4 ) with variable Co/ Mn molar ratios is deeply discussed. Single-phase ferrites with similar crystallite and particle sizes (about 10 nm), size dispersity (14%), and weight percentage of capping oleate molecules (17%) were obtained by an oleate-based solvothermal approach. The similarities among the samples permitted the interpretation of the results exclusively on the basis of the actual composition, beyond the other parameters. The temperature and magnetic field dependences of the magnetization were studied together with the interparticle interactions by DC magnetometry. Characteristic temperatures (T max , T diff , and T b ), coercivity, anisotropy field, and reduced remanence were found to be affected by the Co/Mn ratio, mainly due to the magnetic anisotropy, interparticle interactions, and particle volume distribution. In addition, the cobalt and manganese distributions were hypothesized on the basis of the chemical composition, the inversion degree obtained by 57 Fe Mossbauer spectroscopy, the anisotropy constant, and the saturation magnetization.

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“…[4,5] Spin-dependent FM is dictated by an exchange process in a series of spinel sulfides that have been under study for ferroelectric and magnetic applications over the last several decades. [6] Magnetic frustration generates net magnetic moments in spinels, which have an atomic spin arrangement similar to ferrite. [7] In general, semiconductor electronic nature of FM spinels is valued for their use in spintronic systems such as memory devices.…”

Section: Introductionmentioning

confidence: 99%

“…[ 4,5 ] Spin‐dependent FM is dictated by an exchange process in a series of spinel sulfides that have been under study for ferroelectric and magnetic applications over the last several decades. [ 6 ]…”

Section: Introductionmentioning

confidence: 99%

Electronic, Structural, Optical, and Magnetic Characteristics A₂MgS₄ of (A=Dy, Er) Spinel Sulfides: A Density Functional Theory Study

Nazar

Nasarullah

Aldaghfag

et al. 2023

Physica Status Solidi (b)

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Density functional theory (DFT) simulations are performed to explore the physical features of Dy2MgS4 and Er2MgS4. Local density approximation with Hubbard potential (LDA + U) functional is utilized to examine the magnetic and electronic features. Half metallic ferromagnetic (HMF) behavior is confirmed by the spin‐resolved density of states (DOS) and band structure (BS) plots. Spin‐resolved BS and DOS show that Dy2MgS4 and Er2MgS4 for spin‐down are metallic, whereas both compounds in spin‐up show semiconductor nature with the bandgaps of 1.731 and 3.081 eV for Dy2MgS4 and Er2MgS4, correspondingly. Both compounds also feature exchange energies and crystal field splitting, indicating the magnetic characteristics. The estimated magnetic moments of X2MgS4 (X = Dy, Er) are 20μB and 12μB, correspondingly, also revealed by spin‐polarized magnetic density. Optical properties such as refractive index n(ω), absorption coefficient α(ω), dielectric constant , reflectivity R(, extinction coefficient k(ω), and optical conductivity σ(ω) are also explored. The optical bandgaps for MgX2S4 (X = Dy, Er) are 1.70 and 1.51 eV, respectively; it shows that both are transparent to visible light. Results indicate that both materials can be suitable for spintronic and solar‐cell usage.

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Magnetic properties of MnCr2O4 nanoparticle

Cited by 31 publications

References 29 publications

Low temperature magnetic transition of chromite in ordinary chondrites

Low temperature magnetic transition of chromite in ordinary chondrites

Evolution of the Magnetic and Structural Properties with the Chemical Composition in Oleate-Capped Mn_xCo_1–xFe₂O₄ Nanoparticles

Electronic, Structural, Optical, and Magnetic Characteristics A₂MgS₄ of (A=Dy, Er) Spinel Sulfides: A Density Functional Theory Study

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Magnetic properties of MnCr2O4 nanoparticle

Cited by 31 publications

References 29 publications

Low temperature magnetic transition of chromite in ordinary chondrites

Low temperature magnetic transition of chromite in ordinary chondrites

Evolution of the Magnetic and Structural Properties with the Chemical Composition in Oleate-Capped MnxCo1–xFe2O4 Nanoparticles

Electronic, Structural, Optical, and Magnetic Characteristics A2MgS4 of (A=Dy, Er) Spinel Sulfides: A Density Functional Theory Study

Contact Info

Product

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Evolution of the Magnetic and Structural Properties with the Chemical Composition in Oleate-Capped Mn_xCo_1–xFe₂O₄ Nanoparticles

Electronic, Structural, Optical, and Magnetic Characteristics A₂MgS₄ of (A=Dy, Er) Spinel Sulfides: A Density Functional Theory Study