Analysis of zero field and field cooled magnetization curves of CoFe2O4 nanoparticles with a T-dependence on the saturation magnetization

Peixoto, E.B.; Carvalho, Maria Helena Catelli de; Meneses, C.T.; Sarmento, Víctor Hugo Vitorino; Coelho, Leandro dos Santos; Zucolotto, Benjamim; Duque, Juan G.

doi:10.1016/j.jallcom.2017.05.246

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…As shown in Figure 8, there is an increase in the blocking temperature with particle size. Notably, the ZFC peaks shift towards the higher temperatures with increasing of Co 2+ dopant ratio, indicating a continuous increase in the average grain size, which agrees with the structural analysis by XRD and TEM [50]. In the same magnetic field, larger particles experience blocking at higher temperature, whereas smaller particles does not seem to behave likewise.…”

Section: Resultssupporting

confidence: 80%

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Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

et al. 2019

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In the present work, we synthesized CoxZn1-xFe2O4 spinel ferrite nanoparticles (x= 0, 0.1, 0.2, 0.3 and 0.4) via the precipitation and hydrothermal-joint method. Structural parameters were cross-verified using X-ray powder diffraction (XRPD) and electron microscopy-based techniques. The magnetic parameters were determined by means of vibrating sample magnetometry. The as-synthesized CoxZn1-xFe2O4 nanoparticles exhibit high phase purity with a single-phase cubic spinel-type structure of Zn-ferrite. The microstructural parameters of the samples were estimated by XRD line profile analysis using the Williamson–Hall approach. The calculated grain sizes from XRPD analysis for the synthesized samples ranged from 8.3 to 11.4 nm. The electron microscopy analysis revealed that the constituents of all powder samples are spherical nanoparticles with proportions highly dependent on the Co doping ratio. The CoxZn1-xFe2O4 spinel ferrite system exhibits paramagnetic, superparamagnetic and weak ferromagnetic behavior at room temperature depending on the Co2+ doping ratio, while ferromagnetic ordering with a clear hysteresis loop is observed at low temperatures (5K). We concluded that replacing Zn2+ ions with Co2+ ions changes both the structural and magnetic properties of ZnFe2O4 nanoparticles.

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Section: Resultssupporting

confidence: 80%

“…In addition, above the blocking temperature the FC magnetization curves follow the same path as ZFC curves. Furthermore, the rapid fall off of the ZFC curve peak for the Co_0 and Co_1 samples and the closeness of T B and T irr values illustrates the narrow size distribution for corresponding samples [49,50,51,52].…”

Section: Resultsmentioning

confidence: 90%

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

et al. 2019

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“…The ZFC curves exhibit typical behaviors of superparamagnetic particles, including a broad peak, thermal hysteresis at low temperatures, and overlapping ZFC/FC magnetization curves at higher temperatures. 36 As the x value increases from 0 to 1, the blocking temperature (T b ) decreases from 45 to 19 K, suggesting a weaker dipole−dipole interaction in nanoparticles as the Ni concentration increases. Above T b , the magnetization decreases with increasing temperature and no clear Curie−Weiss law behavior is observed.…”

Section: ■ Experimental Sectionmentioning

confidence: 97%

Synthesis and Self-Assembly of Nickel-Substituted Ferrite Nanoparticles with Controlled Morphology and Chemical Composition

Li,

Chen

2023

ACS Appl. Electron. Mater.

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“…Evidences confirmed that undoped BTCZO is diamagnetic, whereas the Fe doping caused a gradual evolution toward ferromagnetism. Peixoto et al [60] produced CoFe 2 O 4 nanoparticles embedded inside a TEOS-derived SiO 2 matrix via sol-gel (for sol-gel processes, refer to [61,62]) and evaluated the magnetic properties by fixing the temperature at either 5 K or 100-200 K confirming a superparamagnetic regime. In this context, it is important to point out that several cases studies reported magnetization curves detected at different temperatures (going from cryogenic conditions to temperature values above/below the Curie point), and this is fundamental for evaluating specific magnetic transition in the (nano)material/system analyzed.…”

Section: Magnetism and Magnetization (Hysteresis) Curvesmentioning

confidence: 99%

Magnetic Materials and Systems: Domain Structure Visualization and Other Characterization Techniques for the Application in the Materials Science and Biomedicine

2020

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Magnetic structures have attracted a great interest due to their multiple applications, from physics to biomedicine. Several techniques are currently employed to investigate magnetic characteristics and other physicochemical properties of magnetic structures. The major objective of this review is to summarize the current knowledge on the usage, advances, advantages, and disadvantages of a large number of techniques that are currently available to characterize magnetic systems. The present review, aiming at helping in the choice of the most suitable method as appropriate, is divided into three sections dedicated to characterization techniques. Firstly, the magnetism and magnetization (hysteresis) techniques are introduced. Secondly, the visualization methods of the domain structures by means of different probes are illustrated. Lastly, the characterization of magnetic nanosystems in view of possible biomedical applications is discussed, including the exploitation of magnetism in imaging for cell tracking/visualization of pathological alterations in living systems (mainly by magnetic resonance imaging, MRI).

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Analysis of zero field and field cooled magnetization curves of CoFe2O4 nanoparticles with a T-dependence on the saturation magnetization

Cited by 9 publications

References 35 publications

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Synthesis and Self-Assembly of Nickel-Substituted Ferrite Nanoparticles with Controlled Morphology and Chemical Composition

Magnetic Materials and Systems: Domain Structure Visualization and Other Characterization Techniques for the Application in the Materials Science and Biomedicine

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