Amorphization of Neutron-Irradiated Yttrium Iron Garnet

Chukalkin, Yu. G.; Shtirts, V. R.; Goshchitskii, B. N.

doi:10.1515/9783112500965-004

Cited by 2 publications

(3 citation statements)

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“…When magnetic ions are included in ferrite phase a ferrimagnetic behavior is observed. In contrast, inclusion of nonmagnetic ions (as zinc − and cadmium) induces an increase in magnetic disorder and a not well-defined ferrimagnetic behavior.…”

Section: Resultsmentioning

confidence: 99%

Nonstoichiometric Zinc Ferrite Nanocrystals: Syntheses and Unusual Magnetic Properties

2000

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This paper demonstrates that, by using oil-in-water micelles, nonstoichiometric zinc ferrite nanoparticles are fabricated. Control in size and composition is obtained. The nanocrystals are characterized by a spinel structure with two sublattices in tetrahedral and octahedral sites. Repartition of Fe 3+ in the two sublattices is disordered. The particles are ferrimagnetic with a noncollinear structure (the magnetic moments are not strictly parallel). This is more pronounced with the smallest particles. Zinc ferrite nanocrystals exhibit unusual magnetic properties. The anisotropy constant, K, of nanocrystals differing by their sizes is determined by Mo ¨ssbauer spectroscopy and from zero field cooled (ZFC) curves. The field cooled (FC) curves show a peculiar behavior with a decrease in the magnetization at very low temperature. The ZFC curves are highly sensitive to the applied field, indicating that Langevin law cannot be applied for zinc ferrite nanocrystals. These unusual magnetic properties are attributed to the inclusion of nonmagnetic zinc ions in ferrite nanocrystals, which induces a magnetic disorder.

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Section: Resultsmentioning

confidence: 99%

Nonstoichiometric Zinc Ferrite Nanocrystals: Syntheses and Unusual Magnetic Properties

2000

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“…The spin structure of the material as a function of temperature is complex with dynamic SRO reported to persist up at least 10T N . This conclusion was reached on the basis of neutron scattering [14,15], Mossbauer resonance [14,16], and muon-spin-rotation/relaxation (µ−SR) (Ref. [14]) studies.…”

Section: Resultsmentioning

confidence: 99%

“…Below T N , long range order (LRO) has been observed in ZnF e 2 O 4 by a number of research groups. However, at temperatures up to ≃10T N , broad maxima have been observed and a model in which small antiferromagnetic regions exhibit "superantiferromagnetic" behaviour due to SRO has been proposed [15]. It has been deduced from the width of the maxima that the size of the domains exhibiting SRO is of the order of 3nm [14].…”

Section: Resultsmentioning

confidence: 99%

Effect of short-range magnetic ordering on electron energy-loss spectra in spinels

et al. 2003

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The energy-loss near-edge structure (ELNES) at the oxygen K edge in two AB 2 O 4 spinels (A=Mg, B=Al,Cr) is reported. In M gAl 2 O 4 the experimental data is successfully modelled within the LDA framework. In the case of M gCr 2 O 4 spin-polarisation, in the form of antiferromagnetic ordering on the Cr sub-lattice, must be included despite the fact that the measurements were performed at approximately 30 times above T N . A model in which dynamic short-range antiferromagnetic ordering is present at room temperature is proposed to explain the results of the experiments and calculations.

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Amorphization of Neutron-Irradiated Yttrium Iron Garnet

Cited by 2 publications

References 0 publications

Nonstoichiometric Zinc Ferrite Nanocrystals: Syntheses and Unusual Magnetic Properties

Nonstoichiometric Zinc Ferrite Nanocrystals: Syntheses and Unusual Magnetic Properties

Effect of short-range magnetic ordering on electron energy-loss spectra in spinels

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