Mössbauer Studies of Core-Shell FeO/Fe3O4 Nanoparticles

Kamzin, A. S.; Valiullin, A. A.; Khurshid, Hafsa; Nemati, Zohreh; Srikanth, H.; Phan, Manh‐Huong

doi:10.1134/s1063783418020129

Cited by 15 publications

(7 citation statements)

References 37 publications

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“…The spectra are given in Figure , and they were collected with different applied fields. The spectra were fitted with two crystalline sextets, labeled sextets 1 and 2, a singlet probably related to Fe 3+ ions in the tetrahedral interstitial sites of the Wüstite structure ,, and sextet with broad lines and lower effective field ( , and is the hyperfine field), labeled sextet 3. The line width was hold between the widths of the six lines of sextet: Γ 3,4 = W + 0.02526 × d W , Γ 2,5 = W + 0.09344 × d W , Γ 1,6 = W + 0.16147 × d W .…”

Section: Resultsmentioning

confidence: 99%

“…Other works report on the formation of Fe 1-y O and a ferrite phase in a core-shell structure after oxidation by the thermal decomposition method [15][16][17][18][19] . As pointed out by Chen et al 20 , the Wüstite phase is formed as consequence of reactions involving some commonly used hydrocarbon solvents and its formation contributes to significant cationic disorder.…”

Section: Introductionmentioning

confidence: 99%

“…When the formation of the Fe 1– y O phase took place during the synthesis, the presence of the AFM phase is expected for larger particles because the oxidation to the FiM phase could not be complete, with an AFM core. Other works report on the formation of Fe 1– y O and a ferrite phase in a core–shell structure after oxidation by the thermal decomposition method. − As pointed out by Chen et al, the Wüstite phase is formed as a consequence of reactions involving some commonly used hydrocarbon solvents and its formation contributes to a significant cationic disorder. The latter formation of the bimagnetic core–shell system due to the surface oxidation of Wüstite results in very distinct magnetic properties with respect to the monophasic nanoparticles. − Therefore, it is very important to determine the factors that govern the formation of core–shell nanoparticles to establish the reproducibility of this synthesis method and the magnetic response of the system.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

et al. 2018

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Magnetic, compositional and morphological properties of Zn-Fe-oxide core-shell bimagnetic nanoparticles (MNPs) were studied for three samples with 0.00, 0.06 and 0.10 Zn/Fe ratios, as obtained from Particle-Induced X-ray Emission analysis. The bimagnetic nanoparticles were produced in one step synthesis by the thermal decomposition of the respective acetylacetonates. The nanoparticles present an average particle size between 25-30 nm as inferred from Transmission Electron Microscopy (TEM). High-Resolution TEM images clearly show core-shell morphology for the particles in all samples. The core is composed by an antiferromagnetic (AFM) phase with Wüstite (Fe 1-y O) structure, while the shell is composed by Zn x Fe 3-x O 4 ferrimagnetic (FiM) spinel phase. Despite the low solubility of the Zn in the Wüstite, Electron energy-loss spectroscopy (EELS) analysis indicates that the Zn is distributed almost homogeneously in the whole nanoparticle. This result gives information on the formation mechanisms of the particle, indicating that the Wüstite is formed firstly, and the superficial oxidation results in the FiM ferrite phase with similar Zn concentration than the core. Magnetization and in-field Mössbauer spectroscopy of the Zn-richest nanoparticles indicate that the AFM phase is strongly coupled to the FiM structure of the ferrite shell, resulting in a bias field (H EB) appearing below T N FeO , with H EB values that depends on the core-shell relative proportion. Magnetic characterization also indicates a strong magnetic frustration for the samples with higher Zn concentration, even at low temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

et al. 2018

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“…In multidomain submicron particles (or other objects, for example, magnetic films), the parameters of the DMH loop are determined, to a great extent, by the motion of domain walls, while in single-domain FM particles, the dynamic hysteresis is related to the effect of the magnetization switching time on the flipping of magnetic moment of a particle [33][34][35][36][37]. The investigations of the DMH in systems of magnetic nanoparticles become very important due to the hyperthermia effect [38][39][40][41][42][43]. Here, it is necessary to understand the effect of the internal properties, including the magnetic anisotropy with its surface contribution, particle size, and features of the magnetic ordering inside a particle [44], on the parameters of the DMH loop, specifically, the coercivity H C , remanent magnetization, and hysteresis loop area.…”

Section: Introductionmentioning

confidence: 99%

Features of the quasi-static and dynamic magnetization switching in NiO nanoparticles: Manifestation of the interaction between magnetic subsystems in antiferromagnetic nanoparticles

Balaev

Krasikov

Popkov

et al. 2020

Journal of Magnetism and Magnetic Materials

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We report on the investigations of a system of 8-nm NiO particles representing antiferromagnetic (AFM) materials, which are weak magnetic in the form of submicron particles, but can be considered to be magnetoactive in the form of nanoparticles due to the formation of the uncompensated magnetic moment in them. The regularities of the behavior of magnetization switching in AFM nanoparticles are established by studying the magnetic hysteresis loops under standard quasi-static conditions and in a quasi-sinusoidal pulsed field of up to 130 kOe with pulse lengths of 4-16 ms. The magnetic hysteresis loops are characterized by the strong fields of the irreversible magnetization behavior, which is especially pronounced upon pulsed field-induced magnetization switching. Under the pulsed field-induced magnetization switching conditions, which are analogous to the dynamic magnetic hysteresis, the coercivity increases with an increase in the maximum applied field H 0 and a decrease in the pulse length. This behavior is explained by considering the flipping of magnetic moments of particles in an external ac magnetic field; however, in contrast to the case of single-domain ferro-and ferrimagnetic particles, the external field variation rate dH/dt is not a universal parameter uniquely determining the coercivity. At the dynamic magnetization switching in AFM nanoparticles, the H 0 value plays a much more important role. The results obtained are indicative of the complex dynamics of the interaction between different magnetic subsystems formed in AFM nanoparticles.

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“…The magnetic and exchange interactions inside an individual nanoparticle, along with the interparticle interactions, are of great importance for the formation of macroscopic properties of the entire magnetic system, as well as for the effective interaction of its individual particles with an ac electromagnetic field. Within this paradigm, MFe 2 O 4 (M = Fe, Co, Mn) particles and core-shell ferrite nanoparticles consisting of a hard magnetic core (CoFe 2 O 4 ) and a magnetite shell (Fe 3 O 4 ) have recently been studied to check the efficiency of their use in hyperthermia [9][10][11][12][13][14][15]. The magnetic measurements show that the coat-ing of the CoFe 2 O 4 hard magnetic phase with magnetite ensures a fairly high coercivity and thereby enhances the efficiency of magnetic hyperthermia.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Magnetic Properties of the Core–Shell Fe3O4/CoFe2O4 Nanoparticles

Balaev¹,

Semenov²,

Dubrovskiĭ³

et al. 2020

Phys. Solid State

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The Fe 3 O 4 /CoFe 2 O 4 nanoparticles with a core-shell structure with an average size of 5 nm have been obtained by codeposition from the iron and cobalt chloride solutions. An analysis of the magnetic properties of the obtained system and their comparison with the data for single-phase Fe 3 O 4 (4 nm) and CoFe 2 O 4 (6 nm) nanoparticles has led to the conclusion about a noticeable interaction between the soft magnetic (Fe 3 O 4 ) and hard magnetic (CoFe 2 O 4 ) phases forming the core and shell of hybrid particles.

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Mössbauer Studies of Core-Shell FeO/Fe3O4 Nanoparticles

Cited by 15 publications

References 37 publications

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core–Shell Nanoparticles Produced in a Single Chemical Synthesis

Features of the quasi-static and dynamic magnetization switching in NiO nanoparticles: Manifestation of the interaction between magnetic subsystems in antiferromagnetic nanoparticles

Synthesis and Magnetic Properties of the Core–Shell Fe3O4/CoFe2O4 Nanoparticles

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