Magnetic properties of soft magnetic Fe@SiO2/ferrite composites prepared by wet/dry method

Onderko, František; Birčáková, Zuzana; Dobák, Samuel; Kollář, P.; Tkáč, Martin; Fáberová, Mária; Füzer, J.; Búreš, Radovan; Szabó, Juraj; Zeleňáková, A.

doi:10.1016/j.jmmm.2021.168640

Cited by 26 publications

(9 citation statements)

References 31 publications

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“…For example, initial permeability is low (around 35), and it remain constant up to 2000 Hz. As known, the permeability strongly depends on the material density, porosity, and non-magnetic phases [ 10 , 21 , 22 ]. The evolution of the initial relative permeability and of the power losses versus frequency is shown in Figure 14 and Figure 15 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The strengthened way of producing such a composite is to cover the ferromagnetic particles with a thin layer of dielectric material and further, to compact the particles with powder metallurgy techniques [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. The dielectric material layer can be of various types [ 8 , 9 , 10 , 11 , 12 , 13 ], and the role of this layer is to insulate the ferromagnetic particles and, in some cases, to bind the composite particles from one to another. Such an approach has limitations, especially related to compact density, the heat treatment that can be applied after densification, and the presence of nonmagnetic phases, etc.…”

Section: Introductionmentioning

confidence: 99%

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Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

et al. 2023

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Soft magnetic composite (SMC) cores have been obtained by Spark Plasma Sintering (SPS) using pseudo core–shell powders. Pseudo core–shell powders are formed by a core of soft magnetic particle (nanocrystalline permalloy or supermalloy) surrounded by a thin layer (shell) of nanosized soft ferrite (Mn0.5Zn0.5Fe2O4). Three compositions of pseudo core–shell powders were prepared, with 1, 2 and 3 w.t% of manganese–zinc mixt ferrite. The pseudo core–shell powders were compacted by SPS at temperatures between 500 and 700 °C, with a holding time ranging from 0 to 10 min. Several techniques have been used for characterization of the samples, both, powders and compacts X-ray diffraction (XRD, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), magnetic hysteresis measurements (DC and AC) and electrical resistivity. The electrical resistivity is in the order of 1 × 10−2 Ωm, 3–4 orders of magnitude higher than supermalloy electrical resistivity. The SPS at lower temperatures (500 °C) conserves the initial phases of the composite, but increasing the sintering temperature and/or sintering time produces a solid-state reaction between the alloy and ferrite phases, with negative consequence on the magnetic properties of the compacts. The initial relative permeability is around 40 and remains constant until to 2000 Hz. The power losses are lower than 2 W/kg until to 2000 Hz.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

et al. 2023

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“…The insulation process was made in two sessions for a total time of 16 h, 8 h for each session. At the end of the insulation process, a high-purity iron powder would have a thin layer of SiO 2 [23,30].…”

Section: Insulation (Preparation Of the Precursor For Soft Magnetic C...mentioning

confidence: 99%

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

Rudeichuk,

Olekšáková,

Maciaszek

et al. 2024

Materials

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This research focuses on the production process of soft magnetic composites in the form of 3D bulk compacts made from insulated powder particles using different milling parameters, aiming to enhance their magnetic properties and to study an innovative method of the powder surface “smoothing” technique. A structure analysis using scanning electron microscopy (SEM), EDS, and optical microscopy is also included. We found out that the samples made by the innovative method have lower density values. This can be caused by a more consistent SiO2 insulation layer on highly pure iron powder particles. A correlation between the mechanical smoothing method and better insulation of powder particles can help to provide eco-friendlier solutions for the preparation of soft magnetic composites, such as less usage of reagents and more consistent coverage of powder particles with lower final insulation thickness. The magnetic properties of these compacts are evaluated by coercive field, permeability, and loss measurements. The particle-level smoothing technique in some cases can reduce the value of coercivity up to 20%. For some samples, the ball-to-powder ratio has a bigger impact on magnetic properties than surface treatment, which can be caused by an increased amount of insulation in the SMC compacts.

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“…the addition of SiO 2 can have a significant effect on the magnetization saturation and the milling behavior of the material. SiO 2 is a non-magnetic material, and its addition can act as a spacer between the Fe nanoparticles, reducing their magnetic interactions [54].…”

Section: Magnetic Measurementsmentioning

confidence: 99%

The impact of Cu, Ni and Fe₂O₃ on the magnetic behavior and structural properties of FeSiO₂ nanocomposite synthesized through ball milling

Younes,

Amraoui,

Manseri

et al. 2023

Phys. Scr.

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The nanocomposite Fe-A/SiO2 soft magnetic materials, with Cu, Ni, and Fe2O3 as dopants, were produced using a mechanical alloying technique. Our central objective was to explore the impact of process parameters on Fe/SiO2 nanocomposite properties. We assessed varying milling time and dopant addition rates, analyzing structural, morphological, and magnetic aspects through SEM, EDS, XRD, and VSM at different synthesis stages. The XRD pattern revealed iron, Fe(Ni), Fe(Cu), and Fe2O3 with an average crystallite size of 28–39 nm and lattice strain of 0.0097%–0.0222%. Notably, the lattice parameters decreased from 0.2852 to 0.2836 nm. Among nanocomposites, FeCu/SiO2 displayed the smallest crystallite size (34.3 nm), while FeNiSiO2 showed the highest lattice parameter (0.2853 nm). The ATR analysis unveiled Si–O–Si stretching vibrations at 1052 cm−1, intensifying with milling time. The inclusion of Cu and Ni in the FeSiO2 system significantly influenced the Si–O–Si bond. Coercivity and remanence magnetization in Fe/SiO2 increased notably with milling time, reaching 68.47 Oe and 8.73 emu g−1, respectively. The Fe/Fe2O3/SiO2 and FeSiO2 nanocomposites exhibited the maximum values of coercivity (47.07 Oe) and remanence magnetization (12.24 emu g−1). Remarkably, the Fe/SiO2 nanocomposite displayed the highest saturation magnetization, measuring an impressive 176.07 emu g−1 after 30 h of milling, while FeCu/SiO2 reached 165.64 emu g−1 after 20 h. Overall, our findings suggest the Fe/SiO2 nanocomposite as a promising high-frequency soft magnetic material.

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Magnetic properties of soft magnetic Fe@SiO2/ferrite composites prepared by wet/dry method

Cited by 26 publications

References 31 publications

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

The impact of Cu, Ni and Fe₂O₃ on the magnetic behavior and structural properties of FeSiO₂ nanocomposite synthesized through ball milling

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Magnetic properties of soft magnetic Fe@SiO2/ferrite composites prepared by wet/dry method

Cited by 26 publications

References 31 publications

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

The impact of Cu, Ni and Fe2O3 on the magnetic behavior and structural properties of FeSiO2 nanocomposite synthesized through ball milling

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The impact of Cu, Ni and Fe₂O₃ on the magnetic behavior and structural properties of FeSiO₂ nanocomposite synthesized through ball milling