Magnetic characteristics and core loss separation in magnetostrictive FeGa and FeGaRE (RE = Tb, Y) alloys

Birčáková, Zuzana; Milyutin, V. A.; Kollář, P.; Fáberová, Mária; Búreš, Radovan; Füzer, J.; Neslušan, Miroslav; Vorobiov, Serhii; Baťková, M.

doi:10.1016/j.intermet.2022.107744

Cited by 10 publications

(9 citation statements)

References 61 publications

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“…Comparison of several common magnetostrictive alloys in terms of the main properties important in the context of their use at elevated frequencies. Data taken from literary sources [34][35][36][37][38]. The information for bulk as cast polycrystalline samples is preferably used.…”

Section: Comparison Of Ac Functional Properties Of Fe-ga With the Mos...mentioning

confidence: 99%

Prospects of Using Fe-Ga Alloys for Magnetostrictive Applications at High Frequencies

Milyutin,

Bureš,

Fáberová

2023

Condensed Matter

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Fe-Ga is a promising magnetostrictive rare-earth free alloy with an attractive combination of useful properties. In this review, we consider this material through the lens of its potential use in magnetostrictive applications at elevated frequencies. The properties of the Fe-Ga alloy are compared with other popular magnetostrictive alloys. The two different approaches to reducing eddy current losses for such applications in the context of the Fe-Ga alloy, in particular, the fabrication of thin sheets and Fe-Ga/epoxy composites, are discussed. For the first time, the results of more than a decade of research aimed at developing each of these approaches are analyzed and summarized. The features of each approach, as well as the advantages and disadvantages, are outlined. In general, it has been shown that the Fe-Ga alloy is the most promising magnetostrictive material for use at elevated frequencies (up to 100 kHz) compared to analogs. However, for a wide practical application of the alloy, it is still necessary to solve several problems, which are described in this review.

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Section: Comparison Of Ac Functional Properties Of Fe-ga With the Mos...mentioning

confidence: 99%

Prospects of Using Fe-Ga Alloys for Magnetostrictive Applications at High Frequencies

Milyutin,

Bureš,

Fáberová

2023

Condensed Matter

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“…These and other recent works demonstrate the capabilities that the MBN technique provides for the analysis of structure–property correlations in various steels and products made from them. Moreover, this method is also used to analyze magnetic characteristics in functional materials, for example, in soft magnetic alloy FeSiCuNbB and magnetostrictive alloy FeGa . In addition, recently it was shown that MBN may be an effective research tool for composites, including SMCs .…”

Section: Introductionmentioning

confidence: 99%

Formation of Effective Non-ferromagnetic Barrier in Fe/MgO Soft Magnetic Composite

Bures,

Neslusan,

Faberova

et al. 2024

ACS Appl. Electron. Mater.

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Soft magnetic ferromagnetic/insulator composites are complex objects in terms of structure and magnetic properties. They depend on many different parameters, among which one of the main ones is the amount of insulator. In this work, the effect of MgO content on magnetization processes in Fe/MgO composites is studied in detail by using a wide combination of properties and structure analysis methods. Several series of samples with content steps up to 0.1 wt % were prepared using standard powder metallurgy operations such as dry mixing, cold pressing, and sintering. The study demonstrates that the evolution of Barkhausen noise with increasing MgO content is not systematic. The second phase acts as an effective barrier to magnetic interaction between neighboring Fe particles only after reaching a certain point, which was found to be about 0.9% wt. Some other properties (coercivity, permeability, elastic properties) also demonstrate nontrivial composition dependence. To reveal the causes of the observed phenomena, the structure of the composites was studied in detail, and it was shown that with an increase in the MgO content in the range of 0.8−1%, a change in the mechanisms of structure formation occurs, which, in turn, affects the properties. The presented results provide insights into developing advanced soft magnetic composites with an optimal combination of a ferromagnetic powder and an insulator.

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“…Most recently, these results were presented at the 19th ICIFMS (2022, Rome) [ 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. An interesting analysis of the core loss separation and magnetic Barkhausen noise at the high-frequency range is recently reported for Fe–19Ga–RE alloys by Bircakova et al [ 65 ].…”

Section: Introductionmentioning

confidence: 99%

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

Golovin

2023

Materials

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Fe–Ga alloys (GalFeNOLs) are the focus of attention due to their enhanced magneto-elastic properties, namely, magnetostriction in low saturation magnetic fields. In the last several years, special attention has been paid to the anelastic properties of these alloys. In this review, we collected and analyzed the frequency-, amplitude-, and temperature-dependent anelasticity in Fe–Ga and Fe–Ga-based alloys in the Hertz range of forced and free-decay vibrations. Special attention is paid to anelasticity caused by phase transitions: for this purpose, in situ neutron diffraction tests with the same heating or cooling rates were carried out in parallel with temperature dependencies measurements to control ctructure and phase transitions. The main part of this review is devoted to anelastic effects in binary Fe–Ga alloys, but we also consider ternary alloys of the systems Fe–Ga–Al and Fe–Ga–RE (RE—Rare Earth elements) to discuss similarities and differences between anelastic properties in Fe–Ga and Fe–Al alloys and effect of RE elements. We report and discuss several thermally activated effects, including Zener- and Snoek-type relaxation, several transient anelastic phenomena caused by phase transitions (D03 ↔ A2, D03 → L12, L12 ↔ D019, D019 ↔ B2, Fe13Ga9 → L12+Fe6Ga5 phases), and their influence on the above-mentioned thermally activated effects. We also report amplitude-dependent damping caused by dislocations and magnetic domain walls and try to understand the paradox between the Smith–Birchak model predicting higher damping capacity for materials with higher saturation magnetostriction and existing experimental results. The main attention in this review is paid to alloys with 17–20 and 25–30%Ga as the alloys with the best functional (magnetostriction) properties. Nevertheless, we provide information on a broader range of alloys from 6 to 45%Ga. Due to the limited space, we do not discuss other mechanical and physical properties in depth but focus on anelasticity. A short introduction to the theory of anelasticity precedes the main part of this review of anelastic effects in Fe–Ga and related alloys and unsolved issues are collected in summary.

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Magnetic characteristics and core loss separation in magnetostrictive FeGa and FeGaRE (RE = Tb, Y) alloys

Cited by 10 publications

References 61 publications

Prospects of Using Fe-Ga Alloys for Magnetostrictive Applications at High Frequencies

Prospects of Using Fe-Ga Alloys for Magnetostrictive Applications at High Frequencies

Formation of Effective Non-ferromagnetic Barrier in Fe/MgO Soft Magnetic Composite

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

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