Superparamagnetism in CoFe2O4 nanoparticles: An example of a collective magnetic behavior dependent on the medium

Virumbrales, M.; Blanco-Gutiérrez, V.; Delgado-Cabello, A.; Sáez-Puche, R.; Torralvo, M.J.

doi:10.1016/j.jallcom.2018.07.096

Cited by 17 publications

(2 citation statements)

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“…The magnetic properties of cobalt-doped MNPs were attributed to the location of Co 2+ cations in the octahedral positions of the particles’ inverse spinel structure replacing Fe 2+ cations with similar magnetic characteristics, so that saturation magnetizations do not especially change. , On the other hand, the larger size of Co 2+ cations (see Table S3) and their disposition in octahedral sites, where the atoms are very close together, involves an increase in the MNPs anisotropy (that is, hard magnetic materials). As a consequence, higher magnetic fields are required to remove the magnetization of these MNPs; that is, they are characterized by large coercive fields as observed from our measurements. , In the case of zinc-doped samples, zinc ions are placed in tetrahedral positions replacing Fe 3+ cations .…”

Section: Procedure: Results and Discussionmentioning

confidence: 99%

Synthesis, Characterization, and Evaluation of Superparamagnetic Doped Ferrites as Potential Therapeutic Nanotools

et al. 2020

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Magnetic nanoparticles (MNPs) are one of the most promising candidates for their use as theranostic agents in the biomedical field due to their potential as contrast agents in magnetic resonance imaging (MRI) and also as heat generators in magnetic hyperthermia treatments. However, despite the large number of publications about this topic, just some few systematic studies about the influence of MNPs composition on their theranostic capabilities have been carried out. In this work, we show a detailed methodology for the preparation of highly monodisperse iron oxide-based MNPs with different cobalt, zinc, and manganese doping extents in the superparamagnetic regime. We aim to provide the tools to control the composition of the particles, as well as for their functionalization to make them highly stable in biological-mimicking media. Procedures to measure the capability of the particles as magnetothermal and MRI negative contrast agents as well as to analyze the influence of doping on such properties are also reported. In all experiments, the applied alternating magnetic fields were within the maximum allowed amplitude, frequency, and amplitude·frequency product range for potential validation of the experimental data toward the potential translation of the present MNPs to the clinical practice.

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Section: Procedure: Results and Discussionmentioning

confidence: 99%

Synthesis, Characterization, and Evaluation of Superparamagnetic Doped Ferrites as Potential Therapeutic Nanotools

et al. 2020

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“…Still, superparamagnetism may be likely to occur, since it has been observed previously in nano-sized -Fe 2 O 3 [48] and it is in fact exclusively reported in ferrites [49] and related binary ferrite compounds [50,51]. [40,41,48].…”

Section: Resultsmentioning

confidence: 81%

Magnetic properties of ilmenite Mn2FeSbO6

Schmidt

2019

Journal of Magnetism and Magnetic Materials

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In the work presented the magnetic properties of the high pressure ilmenite phase Mn 2 FeSbO 6 are investigated in detail. It is shown that Mn 2 FeSbO 6 ilmenite is ferrimagnetic (T N ≈ 270 K) and exhibits a near-zero coercive field H C . Furthermore, the Mn 2+ -Mn 2+ , Fe 3+ -Fe 3+ and Mn 2+ -Fe 3+ magnetic exchange interactions exhibit gradual and continuous variations with temperature and magnetic field. The ferrimagnetic moment is unsaturated even at 120 kOe below the theoretical value of 5  B per f.u.

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Magnetism in Nanostructured Spinel Ferrites with Recent Advances in Processing, Characterization, and Applications

Devi

Singh

2022

Materials Horizons: From Nature to Nanomaterials

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Superparamagnetism in CoFe2O4 nanoparticles: An example of a collective magnetic behavior dependent on the medium

Cited by 17 publications

References 42 publications

Synthesis, Characterization, and Evaluation of Superparamagnetic Doped Ferrites as Potential Therapeutic Nanotools

Synthesis, Characterization, and Evaluation of Superparamagnetic Doped Ferrites as Potential Therapeutic Nanotools

Magnetic properties of ilmenite Mn2FeSbO6

Magnetism in Nanostructured Spinel Ferrites with Recent Advances in Processing, Characterization, and Applications

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