Magnetic properties of core/shell-structured CoFe2/CoFe2O4 composite nano-powders synthesized via oxidation reaction

Zhang, Yue; Yan, Baiqian; Ouyang, Jun; Zhu, Benpeng; Chen, Shi; Yang, Xiaofei; Liu, Yong; Xiong, Rui

doi:10.1016/j.ceramint.2015.05.152

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…Several studies report decoupling at RT in monoxide-containing samples 29,[45][46][47][48] Some decoupled ''monoxide-free'' examples are also found. [49][50][51][52][53] However, we consider it possible that the monoxide was overlooked in those works. The proximity in 2y of the monoxide and the spinel Bragg positions (see Fig.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocomposites

Granados-Miralles

Quesada

Saura-Múzquiz

et al. 2020

Mater. Chem. Front.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocomposites

Granados-Miralles

Quesada

Saura-Múzquiz

et al. 2020

Mater. Chem. Front.

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“…Successes in fabricating thin film oxide/metal structures have led to breakthrough advances in the study in magnetic materials, for example, giant magnetoresistance (GMR) for memory devices [2], the anomalous Hall effect in thin film nanostructures for spintronic studies [3] and exchange spring behavior for improving permanent magnets PMs [4]. Excellent grain size control and intimate mixing of oxide/metal phases leading to exchange coupling have also been demonstrated in nanopowders [5][6][7]. The exchange spring concept [8] requires a high volume concentration of high-quality interfaces between hard and soft magnetic phases and is a promising way of reducing the rare earth content in permanent magnets.…”

Section: Introductionmentioning

confidence: 99%

“…Morales et al [10] showed ferrimagnetic-antiferromagnetic coupling leading to exchange bias in iron oxide-based magnets. Zhang et al [7] used core-shell approach to show exchange coupling in CoFe 2 O 4 / CoFe 2 magnetic powder composites. Zhang et al [11] also showed successful hard/soft magnetic ferromagnetic coupling in CAPAD-densified CoFe 2 O 4 / CoFe 2 .…”

Section: Introductionmentioning

confidence: 99%

Nanoscale integration of oxides and metals in bulk 3D composites: leveraging SrFe12O19/Co interfaces for magnetic exchange coupling

2019

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The integration of different material classes (e.g, oxides and metals) with nanoscale dimensions in large 3D materials remains a fundamental challenge in nanocomposite fabrication. The incentive is that some of the most interesting properties occur at nanoscale interfaces, while the challenge arises from the difficulty in densifying the materials without deleterious reaction at the interface. Here, we introduce a method based on the synthesis of core-shell powders followed by efficient, relatively low-temperature densification with current-activated pressure-assisted densification. The composition of the bulk nanocomposites can be controlled by varying the core-shell weight ratio, leading to controllable thicknesses of the hard/soft magnetic phases. We demonstrate intimate mixtures of nanoscale strontium ferrite (hard magnetic phase) and Co-Fe (soft magnetic phase) with minimal reaction. The high volume content of high-quality oxide/metal interfaces leads to magnetic exchange coupling in the composites.

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“…Magnetic cobalt ferrite (CoFe 2 O 4 ) nanoparticles have been considered lately 23,24 due to its thermal and chemical stability as core for heterogeneous nanocatalysts for photocatalysis, 25 phenol degradation, 26 acetylene decomposition for carbon nanotubes production, 27 for biomedical applications 28 and may be used as support of oxides for transesterification reactions of vegetable oil and fats. 23,24 Considering the vast range of applications that CoFe 2 O 4 nanoparticles cover, different synthesis procedures are proposed to suit the material obtained with its usage.…”

Section: Introductionmentioning

confidence: 99%

“…23,24 Considering the vast range of applications that CoFe 2 O 4 nanoparticles cover, different synthesis procedures are proposed to suit the material obtained with its usage.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

Falcão¹,

Garcia²,

Moura³

et al. 2017

J. Braz. Chem. Soc.

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Biodiesel production has gained a lot of attention due to its environmental benefits and production from renewable sources. Here, it is reported a magnetically recoverable catalyst of SrO immobilized on a CoFe 2 O 4 support (SrO/CoFe 2 O 4 ), which was efficiently applied for babassu oil transesterification and used up to four cycles without a significant activity loss. The stability and performance of the catalyst were analyzed considering the solvent used for its synthesis. Characterizations such as vibrating sample magnetometer (VSM), thermogravimetry (TG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were performed. The present study demonstrated that the catalyst has a strong magnetic response, which reflects the nature of the nanoparticles. For the first run, the material presented a yield of 96% when synthesized in acetone in a molar proportion of SrO/CoFe 2 O 4 of 5:1.

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Magnetic properties of core/shell-structured CoFe2/CoFe2O4 composite nano-powders synthesized via oxidation reaction

Cited by 8 publications

References 29 publications

Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocomposites

Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocomposites

Nanoscale integration of oxides and metals in bulk 3D composites: leveraging SrFe12O19/Co interfaces for magnetic exchange coupling

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

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