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Number of results: 7
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Hard magnetic material measurements in a pulsed field magnetometer considering coating and eddy current effects

Alexander Kern Nora Leuning Kay Hameyer
Archives of Electrical Engineering | 2023 | vol. 72 | No 2 | 407-414 | DOI: 10.24425/aee.2023.145416
Keywords eddy current effects hard magnetic materials magnetic property measurement
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Abstract

Rare-earth permanent magnets are coated in order to avoid corrosion. When considering the rated geometrical properties of a sample, the coating thickness has to be known precisely as it wrongly enlarges the magnetically active volume which in turn affects the accuracy of the measured magnetic properties. In this work, the sensitivity of hard magnetic material property measurements regarding the consideration of different coating thicknesses is evaluated. Moreover, the impact of eddy current effects on the magnetic properties is studied when measuring in an open circuit. Additionally, an outlook for a measurement-based determination of the electric conductivity of permanent magnet samples is given.
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Authors and Affiliations

Alexander Kern
1
ORCID: ORCID
Nora Leuning
1
ORCID: ORCID
Kay Hameyer
1
ORCID: ORCID
  1. Institute of Electrical Machines (IEM), RWTH Aachen University, Schinkelstr. 4, D-52062 Aachen, Germany

Post-Synthesis Microwave Plasma Treatment Effect on Magnetization and Morphology of Manganese-Iron Oxide Nanoparticles

Muhammad Aqib Busharat Muhammad Yasin Naz Shazia Shukrullah Muhammad Zahid
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 3 | 837-842 | DOI: 10.24425/amm.2022.139673
Keywords Ferrite nanoparticles microwave discharge sol-gel synthesis magnetic properties
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Abstract

The influence of microwave (MW) plasma on magnetization and morphology of sol-gel synthesized MnFe2O4 ferrite nanoparticles is investigated in this study. Manganese (II) nitrate hexahydrate, ferric (III) nitrate nanohydrate and citric acid were used to synthesize ferrite nanoparticles via a facile sol-gel route. These ferrite nanostructures were heat-treated at 700ºC and then given MW plasma treatment for 10 min. The pristine MnFe2O4 and plasma treated MnFe2O4 showed almost similar structural formation with a slight increase in crystallinity on plasma treatment. However, XRD peak intensity slightly increased after plasma treatment, reflecting better crystallinity of the nanostructures. The size of the particle increased from 35 nm to 39 nm on plasma treatment. It was challenging to deduce the surface morphology of the nanoparticles since both samples were composed of a mixture of big and small clusters. Clusters that had been treated with plasma were larger in size than pristine ones. The band gap energy of the pristine MnFe2O4 sample was about 5.92 eV, which increased to 6.01 eV after treatment with MW plasma. The saturation magnetization of MnFe2O4 sample was noted about 0.78 emu/g before plasma treatment and 0.68 emu/g after MW plasma treatment.
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Authors and Affiliations

Muhammad Aqib Busharat
1
ORCID: ORCID
Muhammad Yasin Naz
1
ORCID: ORCID
Shazia Shukrullah
1
ORCID: ORCID
Muhammad Zahid
2
ORCID: ORCID
  1. Department of Physics, University of Agriculture Faisalabad, 38040, Pakistan
  2. Department of Chemistry, University of Agriculture Faisalabad, 38040, Pakistan

Influence of Aluminium and Silicon Content on the Phase Composition, Microstructure and Magnetic and Mechanical Properties of Multicomponent FeNiCoAlSi Alloys

B. Kurowski D. Oleszak
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 2 | 765-768 | DOI: 10.24425/amm.2023.142459
Keywords multicomponent FeNiCoAlSi alloys phase composition microstructure hardness magnetic properties
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Abstract

This work deals with the characterization of structure, magnetic and mechanical properties of (FeNiCo)100-x(AlSi)x (x = 0, 5, 10, 15, 25) multicomponent alloys prepared by casting. The results of X-ray diffraction measurements, scanning electron microscopy observations and hardness and magnetic properties investigations are presented. The studies show that cast (FeNiCo)100-x(AlSi)x alloys reveal dendritic morphology and their phase composition depends on (Al + Si) content. For x ≤ 10 a face-centered cubic phase is observed, while the increase of Al and Si content results in a body-centered cubic phase formation. It leads to a fivefold increase of hardness from 88 HV to 526 HV. The investigated alloys have high magnetic induction reaching 170 emu/g, while their coercivity value is even up to 2.9 kA/m for x = 15, and strongly depends on chemical and phase composition.
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Authors and Affiliations

B. Kurowski
1
ORCID: ORCID
D. Oleszak
1
ORCID: ORCID
  1. Warsaw University of Technology, Faculty of Materials Science and Engineering, Woloska Str. 141, 02-507 Warsaw, Poland

Influence of annealing conditions on changes of the structure and selected properties of Al88Y7Fe5 and Al88Y6Fe6 alloys

Rafał Babilas Monika Spilka Wojciech Łoński Adrian Radoń Mariola Kądziołka-Gaweł Piotr Gębara
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 2 | e144614 | DOI: 10.24425/bpasts.2023.144614
Keywords Al-Y-Fe metallic glasses heat treatment structural tests corrosion resistance magnetic properties
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Abstract

Al-Y-Fe amorphous and nanocrystalline alloys are characterized by a unique collection of diverse properties that are influenced by various factors, including heat treatment. In this paper, the effect of heat treatment on the structural changes and selected properties of Al-Y-Fe metallic glasses in the as-spun state is investigated. The structure of the Al88Y7Fe5 and Al88Y6Fe6 alloys was examined by X-ray diffraction (XRD) and Mössbauer spectroscopy (MS). The corrosion resistance of the samples was characterized using polarization tests in a 3.5% NaCl solution at 25 °C. The effect of sodium chloride on the surface was studied with scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The magnetic properties of Al-based alloys were explored using a vibrating sample magnetometer (VSM). It was revealed that the tested alloys show better properties after annealing than in the as-spun state. The annealing of the Al88Y7Fe5 and Al88Y6Fe6 alloys in the temperature range of 200 to 300 °C improved the magnetic properties and corrosion resistance of these materials. After 3,600 s, the better EOCP values were recorded for the Al88Y6Fe6 and Al88Y7Fe5 alloys after annealing at 300 °C and 200 °C, adequately. On the basis of the polarization tests, it was concluded that the electrochemical properties are better for Al88Y6Fe6 alloys after annealing at 300 °C.
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Authors and Affiliations

Rafał Babilas
1
ORCID: ORCID
Monika Spilka
1
ORCID: ORCID
Wojciech Łoński
1
Adrian Radoń
2
Mariola Kądziołka-Gaweł
3
Piotr Gębara
4
  1. Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
  2. Łukasiewicz Research Network, Institute of Non-Ferrous Metals, Sowinskiego 5, 44-100 Gliwice, Poland
  3. Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
  4. Department of Physics, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Czestochowa, Poland

A Study on the Optimization of Metalloid Contents of Fe-Si-B-C Based Amorphous Soft Magnetic Materials Using Artificial Intelligence Method

Young-Sin Choi Do-Hun Kwon Min-Woo Lee Eun-Ji Cha Junhyup Jeon Seok-Jae Lee Jongryoul Kim Hwi-Jun Kim
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1459-1463 | DOI: 10.24425/amm.2022.141074
Keywords Fe-based amorphous Soft magnetic properties Artificial intelligence machine learning Random forest regression
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Abstract

The soft magnetic properties of Fe-based amorphous alloys can be controlled by their compositions through alloy design. Experimental data on these alloys show some discrepancy, however, with predicted values. For further improvement of the soft magnetic properties, machine learning processes such as random forest regression, k-nearest neighbors regression and support vector regression can be helpful to optimize the composition. In this study, the random forest regression method was used to find the optimum compositions of Fe-Si-B-C alloys. As a result, the lowest coercivity was observed in Fe80.5Si3.63B13.54C2.33 at.% and the highest saturation magnetization was obtained Fe81.83Si3.63B12.63C1.91 at.% with R2 values of 0.74 and 0.878, respectively.
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Authors and Affiliations

Young-Sin Choi
1 2
ORCID: ORCID
Do-Hun Kwon
1
ORCID: ORCID
Min-Woo Lee
1
ORCID: ORCID
Eun-Ji Cha
1
ORCID: ORCID
Junhyup Jeon
3
ORCID: ORCID
Seok-Jae Lee
3
ORCID: ORCID
Jongryoul Kim
2
ORCID: ORCID
Hwi-Jun Kim
1
ORCID: ORCID
  1. Smart Liquid Processing R&D Department, Korea Institute of Industrial Technology, 156, Gaetbeol-ro, Yeonsu-Gu, Incheon 21999, Korea
  2. Hanyang Univ., Department of Materials Science and Chemical Engineering, Ansan 15588, Korea
  3. Jeonbuk National Univ., Division of Advanced Materials Engineering, Jeonju 54896, Korea

Control of Nd-Fe-B Morphology as Function of the PVP Concentration Using Electrospinning Process

Nu Si A Eom Muhammad Aneeq Haq Jimin Lee Kyoung-Mook Lim Taek Soo Kim Yong-Ho Choa Bum Sung Kim
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 3 | 993-996 | DOI: 10.24425/amm.2020.133204
Keywords Nd2Fe14B 1-D magnet fiber electrospinning Magnet properties Morphology
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Abstract

In this study, we demonstrate a facile and cost-effective way to synthesize Nd-Fe-B of various shapes such as powders, rods and fibers using electrospinning, heat-treatment and washing procedures. Initially Nd-Fe-B fibers were fabricated using electrospinning. The as-spun Nd-Fe-B fibers had diameters ranging 489 to 630 nm depending on the PVP concentration in reaction solutions. The different morphologies of the Nd2Fe14B magnetic materials were related to the difference in thickness of the as-spun fibers. The relationships between the as-spun fiber thickness, the final morphology, and magnetic properties were briefly elucidated. The intrinsic coercivity of Nd2Fe14B changed with the change in morphology from powder (3908 Oe) to fiber (4622 Oe). This work demonstrates the effect of the Nd-Fe-B magnetic properties with morphology and can be extended to the experimental design of other magnetic materials.

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Authors and Affiliations

Nu Si A Eom
Muhammad Aneeq Haq
Jimin Lee
Kyoung-Mook Lim
Taek Soo Kim
Yong-Ho Choa
ORCID: ORCID
Bum Sung Kim

Magnetic Properties of Fe-Si Electrical Steel after Laser Scribing

K. Ścibisz J. Krawczyk
Archives of Metallurgy and Materials | 2024 | vol. 69 | No 1 | 381-387 | DOI: 10.24425/amm.2024.149105
Keywords Grain-oriented electrical steel magnetic domains laser scribing magnetic properties Barkhausen’s noises
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Abstract

Improvement of magnetic properties of electrical steel can be achieved by reduction the size of magnetic domains. The application of local stresses through laser scribing leads to reduced core losses. In order to determine the effect of laser refinement conditions of magnetic domains on the properties of the soft magnetic material, four samples with a thickness 0.23 mm were refined. The refinement of each sample was carried out using different line energies of the laser beam. Estimation of the magnetic domain size was performed using the Jeffries method, the magnetic viewer was used to reveal the domain structure. The measurement of the magnetic properties was performed at a frequency of 50 Hz and an induction of 1.5 T. The analyzed results presented in this work indicate impact of laser refining on magnetic properties of grain oriented electrical steel depending on used laser beam energy.
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Authors and Affiliations

K. Ścibisz
1
ORCID: ORCID
J. Krawczyk
2
ORCID: ORCID
  1. ArcelorMittal Poland S.A. Unit in Krakow, Tadeusza Sendzimira 1 Str., 31-752 Krakow, Poland; AGH University of Krakow, Faculty of Metals Engineering and Computer Science, AGH Do ctoral School, al. Mickiewicza 30, 30-059 Krakow, Poland
  2. AGH University of Krakow, Faculty of Metals Engineering and Computer Science, Al. Mickiewicza 30, 30-059 Krakow, Poland

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