Preferential spin canting in nanosize zinc ferrite

Pandey, Brajesh; Litterst, F. J.; Baggio-Saitovitch, E.

doi:10.1016/j.jmmm.2015.03.049

Cited by 32 publications

(28 citation statements)

References 19 publications

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“…The Mössbauer parameters of the ZnFe 2 O 4 NPs ( Fig. 1a; δ = 0.37 mm/s, QS = 0.60 mm/s) are comparable to those observed for 11 nm nanostructured zinc ferrite prepared by high energy ball milling [6] and to 10 nm zinc ferrite NPs synthesized from ferric nitrate solution [7]. It can be concluded that the small particle sizes (3-7 nm, [3]) lead to a fast superparamagnetic relaxation resulting in doublets at room temperature.…”

Section: Resultssupporting

confidence: 74%

Spin canting in ferrite nanoparticles

et al. 2016

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Recently, an easily scalable process for the production of small (3−7 nm) monodisperse superparamagnetic ferrite nanoparticles MeFe 2 O 4 (Me = Zn, Mn, Co) from iron metal and octanoic acid has been reported (Salih et al., Chem. Mater. 25 1430-1435 2013). Here we present a Mössbauer spectroscopic study of these ferrite nanoparticles in external magnetic fields of up to B = 5 T at liquid helium temperatures. Our analysis shows that all three systems show a comparable inversion degree and the cationic distribution for the tetrahedral A and the octahedral B sites has been determined to (Zn 0.19 Fe 0.81 ) A [Zn 0.81 Fe 1.19 ] B O 4 , (Mn 0.15 Fe 0.85 ) A [Mn 0.85 Fe 1.15 ] B O 4 and (Co 0.27 Fe 0.73 ) A [Co 0.73 Fe 1.27 ] B O 4 . Spin canting occurs presumably in the B-sites and spin canting angles of 33 • , 51 • and 59 • have been determined for the zinc, the manganese, and the cobalt ferrite nanoparticles.

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Section: Resultssupporting

confidence: 74%

Spin canting in ferrite nanoparticles

et al. 2016

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“…Lower saturation magnetization of NPs with citrate ions relative to the M s of the same NPs without citrate ions can be related to the smaller size of the former NPs, 7 nm, which leads to higher spin canting effects [30]. However, at lower temperature, i.e.…”

Section: Magnetization Measurementsmentioning

confidence: 98%

Hydrothermal synthesis of fine stabilized superparamagnetic nanoparticles of Zn2+ substituted manganese ferrite

Zahraei

Monshi

Morales

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…In basic research, the underlying magnetism of ZFO has been of interest over the last four decades [23][24][25][26][27][28][29][30][31][32] and several studies were performed using a large variety of experimental techniques until now. In cases where M is a non-magnetic metal (Zn, for example) and normal ferrites (as in the case of ZFO) the Fe ions occupy solely the B sites and only B-O-B interactions occur.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Depending on the method and growth conditions of the sample [7,38,39,Ref. 5 and references therein], or when the characteristic lengths of the sample are reduced to the nanoscale [32], meta-stable phases can be formed with a disordered arrangement of Zn and Fe in sites A and B.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…In consequence, depending on the synthesis method or the dimensions of the sample, changes in the Fe-Fe interactions (and therefore in the magnetic response of the system) can occur. As an example, Pandey et al [32] and Jesus et al [33] showed that thin films or ZFO-nanoparticles present ferromagnetic behaviour at high temperatures. This result was attributed to cationic inversion [40].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Ab initio calculation of structural, electronic and magnetic properties and hyperfine parameters at the Fe sites of pristine ZnFe2O4

Quintero

Torres

Errico

2018

Journal of Alloys and Compounds

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initio study of the role of defects on the magnetic response and the structural, electronic and hyperfine properties of ZnFe 2 O 4 , Journal of Alloys and Compounds (2018), doi: https://doi.In this work the effects of defects (oxygen vacancies, cationic inversion) on the structural, electronic and the magnetic response of the spinel ZnFe 2 O 4 (ZFO) are studied by using a density functional theory (DFT) based ab initio method (the Full-Potential Linearized Augmented Plane Waves plus Local Orbitals, LAPW+lo) on the framework of the Generalized Gradient Approximation plus U (GGA+U) level. The changes induced by the defects in the hyperfine interactions at the Fe sites of the structure are also presented. In order to discuss the magnetic ordering and the electronic structure of the system we considered different spin arrangements.We found that, similar to the normal and pristine case, reduced and partially inverted ZFO presents an energy landscape characterized by a large number of metastable states. Our calculations successfully describe the hyperfine properties (isomer shift, magnetic hyperfine field and quadrupole spliting) at the Fe sites that are seen by Mössbauer Spectrocopy (MS) at 4 and 300 K, enabling us to characterize the local structure around Fe atoms. Our LAPW+lo predictions also demonstrate the relevance of both oxygen vacancies and antisites (cationic inversion) in the formation of local ferromagnetic coupling between Fe ions, giving rise to a M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTferrimagnetic ordering in an otherwise antiferromagnetic compound. This results support conclusions based in experimental results obtained in x-ray magnetic circular dichroism and magnetization measurements performed on zinc ferrites with different cation distributions and oxygen vacancy concentrations reported in the literature. IntroductionTransition-metal oxides exhibit an incredibly wide variety of behaviours. They can be insulators, semiconductors or metals and present properties such as ferroelectricity, magnetism or superconductivity. Different types of defects (vacancies, antisites, structural distortions, surface effects, substitutional or interstitial impurities, among others) play a fundamental role in the origin of these properties and behaviours. Then, understanding the relation defect-properties is fundamental for the development of new functionalities, for example spintronics [1-3]. The main goal in this field is to obtain materials that can be semiconducting and ferromagnetic at room temperature and integrate them into heterostructures that could be used as spin valves and spin filters.Within the set of oxides that have been considered for their possible application in spintronics, ferrites (MFe 2 O 4 ) have emerged as a very interesting possibility [4,5]. Ferrites crystallize in the spinel face-centered cubic structure and are characterized by an atomic arrangement of two sites for the cations: sites A (tetrahedral oxygen coordination) and sites B (octahedral oxygen coordination) [6]. Two t...

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Preferential spin canting in nanosize zinc ferrite

Cited by 32 publications

References 19 publications

Spin canting in ferrite nanoparticles

Spin canting in ferrite nanoparticles

Hydrothermal synthesis of fine stabilized superparamagnetic nanoparticles of Zn2+ substituted manganese ferrite

Ab initio calculation of structural, electronic and magnetic properties and hyperfine parameters at the Fe sites of pristine ZnFe2O4

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