Synthesis and magnetic properties of Zn1−xMnxFe2O4 nanoparticles

Wang, Jun; Zeng, Chuan; Peng, Zhenmeng; Chen, Qianwang

doi:10.1016/j.physb.2004.02.014

Cited by 90 publications

(49 citation statements)

References 7 publications

(6 reference statements)

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“…Sample with x = 0.06 gives a magnetization of ϳ400 emu/ g at 10 K in a field H Ͼ 2 T, if only MnFe 2 O 4 contribution is considered. This value is one order of magnitude greater than that reported for pure MnFe 2 O 4 , 15,16 implying that the tiny amount of MnFe 2 O 4 impurity make little contribution to the magnetization observed in our codoped In 2 O 3 samples with x = 0.04 and 0.06. In addition, if the contribution from MnFe 2 O 4 phase is deducted from -T curves, calculated difference between curves is less than 1%.…”

contrasting

confidence: 58%

“…One could argue that the observed roomtemperature ferromagnetism arises from the impurity phase ͑MnFe 2 O 4 ͒. 15,16 However, if the observed magnetization is contributed only from the MnFe 2 O 4 phase, then the calculated magnetization should be close to 40 emu/ g at 5 K and H Ͼ 3 T. 15,16 In fact, we have prepared pure impurity sample of MnFe 2 O 4 using the same preparation conditions for all other samples used in this work. Our MnFe 2 O 4 samples showed a magnetization of 43 emu/ g at 10 K and H Ͼ 3 T, the same as that reported for MnFe 2 O 4 .…”

mentioning

confidence: 96%

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Room-temperature ferromagnetism in Mn and Fe codoped In2O3

Peleckis

Wang

Dou

2006

Applied Physics Letters

100

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The synthesis and characterization of polycrystalline room-temperature ferromagnetic semiconductor (In0.9Fe0.1−xMnx)2O3 (x=0–0.1) oxide are reported. All of the samples with intermediate x values are ferromagnetic at room temperature. The highest saturation magnetization moment at 300K per total amount of magnetic ion is reached in the (In0.9Fe0.04Mn0.06)2O3 sample. The lattice constant a increases linearly with increasing Mn content. Fe-only doped samples were paramagnetic, while a Mn-only doped sample was found to be ferromagnetic below TC=46K.

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confidence: 58%

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confidence: 96%

Room-temperature ferromagnetism in Mn and Fe codoped In2O3

Peleckis

Wang

Dou

2006

Applied Physics Letters

100

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“…Mn x Zn 1−x Fe 2 O 4 belongs to the group of cubic spinel structures with magnetic ions Fe 3+ , and Fe 2+ distributed in octahedral and tetrahedral sites, depending on the x-value (see Table I) [4]. The magnetic properties of the ferrite nanoparticles are found to undergo changes because of superparamagnetism, surface spin eects, and cation distribution, which depends mainly on the stoichiometry and synthesis method [5,6]. Among the many experimental research methods to study the magnetic properties of the ferrite nanoparticles, electron paramagnetic resonance (EPR) proves to be a useful and sensitive technique to provide information about local magnetic properties, correlation between the particle moments, and the internal eld distribution [710].…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Features of Mn_1-xZn_xFe₂O₄Nanoparticles

Mendoza

Prado²,

Almanza

2012

Acta Phys. Pol. A

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This paper reports on the magnetic properties of Mn1−xZnx-ferrite nanoparticles. Dierent x compositions of the magnetic material have been considered. Field-and temperature-dependent magnetization curves and electron paramagnetic resonance (EPR) at dierent temperatures were used to reveal the magnetic properties of the samples. For x = 0.5, the EPR spectra consist of a single resonance signal, strongly symmetrical, with g = 3.25 close to 2073 G, and an asymmetric line corresponding to g = 4.4 for x = 0. The asymmetry is attributed to a random distribution of the anisotropy in the system, with perpendicular and parallel modes, giving information about the eective anisotropy of the system. For high concentrations, the resonant eld shifts to 2875 G. Magnetization measurements as function of temperature at 60 Oe according to the standard zero eld cooling (ZFC) and eld cooling (FC) procedures are reported. The behavior of eld cooling magnetization (MFC) at low temperatures evidences the presence of strong interparticles interactions.

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“…An increase in saturation magnetization and coercivity is observed with increase in Dy content. This can be attributed to the superexchange interactions between the tetrahedral (A) and octahedral (B) site ions in the spinel lattice [39]. In ferrites saturation magnetization depends on the type and the number of ions located at the tetrahedral (A) and octahedral [B] sites because this distribution affects the magnetizations, M S and H C of the A and B sublattices, respectively.…”

Section: M-h Hysteresis Loopmentioning

confidence: 99%

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

Kadam

Rajpure

2016

J Mater Sci: Mater Electron

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In the present work nanocrystalline dysprosium substituted Ni 0.8 Co 0.2 Fe 2-x Dy x O 4 (x = 0.00, 0.025, 0.050, 0.075 & 0.1) ferrite system was synthesized by the solution combustion method. The phase formation has been confirmed by Reitveld analysis of XRD patterns, which is a characteristic of spinel ferrite with most intense (311) peak. The bond lengths and site radii of tetrahedral and octahedral sites are found to increase with increase in Dy content. IR measurements showed two prominent bands which are common characteristics of spinel ferrite. The surface morphology shows spherical grains of increasing size with increase in Dy content. The dielectric measurements show the usual dielectric dispersion due to space charge polarization. The electrical resistivity of Ni-Co ferrites is found to increase with Dy content. This can be explained on the basis of formation of DyFeO 3 secondary phase along with spinel lattice. Complex impedance spectra show incomplete semicircles due to the high resistance values at low frequency. Magnetic measurements reveal low coercive field with increase in Dy content. Low coercive fields suggest the use of these materials in data storage and magnetic shielding devices.

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Synthesis and magnetic properties of Zn1−xMnxFe2O4 nanoparticles

Cited by 90 publications

References 7 publications

Room-temperature ferromagnetism in Mn and Fe codoped In2O3

Room-temperature ferromagnetism in Mn and Fe codoped In2O3

Structural and Magnetic Features of Mn_1-xZn_xFe₂O₄Nanoparticles

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

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Synthesis and magnetic properties of Zn1−xMnxFe2O4 nanoparticles

Cited by 90 publications

References 7 publications

Room-temperature ferromagnetism in Mn and Fe codoped In2O3

Room-temperature ferromagnetism in Mn and Fe codoped In2O3

Structural and Magnetic Features of Mn1-xZnxFe2O4Nanoparticles

Compositional variation of structural, electrical and magnetic properties of Dy substituted Ni–Co spinel ferrite

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Product

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Structural and Magnetic Features of Mn_1-xZn_xFe₂O₄Nanoparticles