Room temperature ferromagnetism in laser ablated Zn ferrite thin films

Raghavender, A. T.

doi:10.1016/j.matlet.2011.08.005

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…The probable reason for the observed ferromagnetic behavior in our case may be due to several facts such as structural rearrangement, which may induce changes due to the superexchange interaction in the tetrahedral (A) and octahedral [B] sites (Deraz et al, 2012). In the case of ZnFe2O4 thin films, the random distribution of Zn 2+ and Fe 3+ at (A) and [B] sites or the defects causes the ferromagnetic behavior (Raghavender, 2011). In ZnFe2O4 nanoparticles or bulk materials, the superexchange interaction between (A) and [B] sites does not seem to favor at room temperature, and when measured below room temperature ZnFe2O4 shows ferromagnetic behavior (Ayyapan et al, 2010;Goya et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

Ferromagnetic Behavior in Zinc Ferrite Nanoparticles Synthesized using Coprecipitation Technique

Berhanu¹,

Raghavender²,

Kebede³

et al. 2015

Sci. Technol. Arts Res. J.

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Article InformationZinc ferrite have been produced and used by humans since long time, however understanding of ZnFe2O4 as a nano structured materials is very useful in order to be used for technological applications. ZnFe2O4 structural, magnetic and electrical properties are different when synthesized using different techniques. Therefore, it would be interesting to investigate the structural and magnetic properties of ZnFe2O4 when in nanosize. In the present work nanocrystalline ZnFe2O4 was synthesized using coprecipitation technique. The structural and magnetic properties of ZnFe2O4 nanopowders were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), dynamic light scattering (DLS), infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). The XRD of ZnFe2O4 nanoparticles showed the single phase spinel structure. The average particle size of ZnFe2O4 calculated from XRD was observed to be 45 nm. DLS measurements showed the average particle size to be 42 nm. Further, the phase formation of ZnFe2O4 was confirmed from the IR measurements. The IR spectra showed the bands corresponding to ZnFe2O4. We observed the room temperature ferromagnetic behavior in synthesized ZnFe2O4 nanoparticles which may be due to the random distribution of Zn 2+ and Fe 3+ at the tetrahedral (A) and octahedral [B] sites. In our future work, we want to investigate the defect induced magnetic properties of ZnFe2O4 nanoparticles which is likely to contribute for ferromagnetic behavior in this material.

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Section: Resultsmentioning

confidence: 99%

Ferromagnetic Behavior in Zinc Ferrite Nanoparticles Synthesized using Coprecipitation Technique

Berhanu¹,

Raghavender²,

Kebede³

et al. 2015

Sci. Technol. Arts Res. J.

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“…A partial migration of Fe atoms from A to B sites yields ferrimagnetic clusters due to the strong A-B superexchange interactions. This partial inversion has been invoked as the source of the much larger magnetization in ZnFe 2 O 4 fine particles [41] or the room temperature ferrimagnetic behavior observed in ZnFe 2 O 4 thin films [39,40].…”

Section: Magnetization Versus Fieldmentioning

confidence: 99%

An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn–ferrite nanoparticles

Antić¹,

Perović²,

Kremenović³

et al. 2013

J. Phys.: Condens. Matter

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The evolution of the magnetic state, crystal structure and microstructure parameters of nanocrystalline zinc-ferrite, tuned by thermal annealing of ∼4 nm nanoparticles, was systematically studied by complementary characterization methods. Structural analysis of neutron and synchrotron x-ray radiation data revealed a mixed cation distribution in the nanoparticle samples, with the degree of inversion systematically decreasing from 0.25 in an as-prepared nanocrystalline sample to a non-inverted spinel structure with a normal cation distribution in the bulk counterpart. The results of DC magnetization and Mössbauer spectroscopy experiments indicated a superparamagnetic relaxation in ∼4 nm nanoparticles, albeit with different freezing temperatures T(f) of 27.5 K and 46 K, respectively. The quadrupole splitting parameter decreases with the annealing temperature due to cation redistribution between the tetrahedral and octahedral sites of the spinel structure and the associated defects. DC magnetization measurements indicated the existence of significant interparticle interactions among nanoparticles ('superspins'). Additional confirmation for the presence of interparticle interactions was found from the fit of the T(f)(H) dependence to the AT line, from which a value of the anisotropy constant of K(eff) = 5.6 × 10(5) erg cm(-3) was deduced. Further evidence for strong interparticle interactions was found from AC susceptibility measurements, where the frequency dependence of the freezing temperature T(f)(f) was satisfactory described by both Vogel-Fulcher and dynamic scaling theory, both applicable for interacting systems. The parameters obtained from these fits suggest collective freezing of magnetic moments at T(f).

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“…Among reported methods such as co-precipitation [1], hydrothermal/solvothermal [4], mechanochemical [5], sol-gel [6] etc., combustion technique assisted by microwave energy has attracted a lot of attention due to its simplicity, cost effective and short time [7]. However this technique is simple and quick, the sintering or calcining post-reaction and the supply of enough energy for this process is appeared to be an important challenge [8].…”

Section: Introductionmentioning

confidence: 99%

Innovative one pot synthesis method of the magnetic zinc ferrite nanoparticles with a superior adsorption performance

2015

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Room temperature ferromagnetism in laser ablated Zn ferrite thin films

Cited by 10 publications

References 20 publications

Ferromagnetic Behavior in Zinc Ferrite Nanoparticles Synthesized using Coprecipitation Technique

Ferromagnetic Behavior in Zinc Ferrite Nanoparticles Synthesized using Coprecipitation Technique

An integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn–ferrite nanoparticles

Innovative one pot synthesis method of the magnetic zinc ferrite nanoparticles with a superior adsorption performance

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