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Wyświetlanie 1-15 z 26
Tytuł:
AC Magnetic Field Effect on the Complex Permeability Spectra of Soft Magnetic $Fe_{73}Cu_{1}Nb_{3}Si_{16}B_{7}$ Powder Cores
Autorzy:
Füzer, J.
Dobák, S.
Füzerová, J.
Powiązania:
https://bibliotekanauki.pl/articles/1367086.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
07.55.-w
85.70.-w
Opis:
In this work, two soft magnetic $Fe_{73}Cu_{1}Nb_{3}Si_{16}B_{7}$ powder core samples were investigated. Samples were prepared by milling of amorphous $Fe_{73}Cu_{1}Nb_{3}Si_{16}B_{7}$ ribbon at different temperature conditions: sample R, by milling at room temperature and sample L, by cryomilling at temperature of liquid nitrogen. Influence of applied exciting AC magnetic field with various amplitudes on the complex permeability spectra was studied. Obtained results are explained by the dynamics and relaxation phenomenon of domain walls under the influence of AC magnetic field.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 88-89
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Temperature on the Magnetization Process in CoFeZrB/FeCuNbMoSiB Hybrid Ferromagnets
Autorzy:
Dobák, S.
Füzer, J.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032660.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.50.Kj
75.50.Tt
75.60.Ch
75.60.Ej
75.30.Gw
85.70.-w
Opis:
The study presents magnetization process behaviour versus operating temperature up to 100°C in dual-phase ferromagnets in the light of their complex permeability spectra and energy losses from quasi-dc regime up to about 1 MHz upon defined peak induction. The samples consist of two Co- and Fe-based ball-milled-ribbon powders mixed in the same mass ratio. The magnetic characterization has been carried out by a digital hysteresisgraph-wattmeter using complex permeability approach to the linear material.
Temperature invoked reduction of anisotropy leads to the decrease of hysteresis losses and significantly affects the low-frequency part of permeability and losses that is ascribed to domain wall movement. The high-frequency behaviour remains unchanged with respect to increase of temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 696-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Frequency Core Losses Components of FeNiMo Powder Compacted Materials
Autorzy:
Olekšáková, D.
Kollár, P.
Füzer, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030429.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Vv
85.70.-w
75.50.Bb
Opis:
The relations of core losses with the frequency of FeNiMo alloys were investigated. The core energy losses were determined by the measurements of dc and ac hysteresis loops as functions of frequency (1 Hz-50 Hz). The usual three-component concept of separation of core losses consisting of hysteresis, eddy current and anomalous losses was used to explain the influence of the powder particle size on core loss frequency dependences.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 639-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft Magnetic Properties in Bulk Permalloy Alloys Fabricated by a Warm Consolidation
Autorzy:
FŰzer, J.
Kollár, P.
Olekšáková, D.
Roth, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813525.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Ev
75.60.Ej
Opis:
Soft magnetic properties of bulk NiFe and NiFeMo alloys consolidated by hot compaction were studied. During annealing the compacts residual stresses diminish by relaxation and soft magnetic properties improve. The lowest coercivity of bulk NiFe and NiFeMo alloys are 11. 0 and 11. 2 A/m, respectively, while the total losses are 1. 81 and 1. 42 W/g at f=10 kHz and $B_\text{max}$ =0. 2 T.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 59-62
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Hot Pressed NiFe Powder
Autorzy:
Olekšáková, D.
Kollář, P.
Fűzer, J.
Kusý, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813529.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Ev
75.60.Ej
Opis:
The aim of this work is to investigate the structure and magnetic properties of compacted microcrystalline NiFe (81 wt. % of Ni) powder. Bulk samples were prepared by compaction of milled NiFe (81 wt. % of Ni) ribbon. We found that after compaction of the powder displacement of domain walls becomes more dominant and the coercivity decreases and is comparable with the coercivity of conventional permalloy. The coercivity of the bulk material before heat treatment is lower than that for powder and that is why we can assume that the magnetic "contact" is restored after compaction. Annealing of bulk samples reduces the losses due to the relaxation of internal stresses induced by milling and compaction.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 75-78
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DC Magnetic Properties of Amorphous Vitrovac Ribbon
Autorzy:
Kollár, P.
Birčáková, Z.
Füzer, J.
Kuźmiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031042.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Jk
75.60.Ch
75.60.Ej
Opis:
Soft magnetic amorphous Co-based materials prepared by rapid quenching method in the form of thin ribbon are well-known due to their excellent soft magnetic properties as high permeability, low coercivity, and low magnetic losses in kHz range. The amorphous Co-Fe-B-Si material Vitrovac® 6155 U55 produced by Vacuumschmelze GmbH & Co. KG belongs to this class of materials and was investigated in as-delivered state. The aim of this work was to study DC magnetization process by various experimental methods. We have measured magnetization curve by fluxmeter based hysteresis graph and hysteresis loops by three different fluxmeter based hysteresis graphs, exhibiting significant differences. The first and the second hysteresis graph perform the hysteresis loops measurement by the point-by-point method, either with commutative or with summing steps. The third one is AC hysteresis graph working at very low frequencies down to 7 mHz, performing the continuous method. The explanation of this result is based on the structural after effect influencing the domain wall displacement. We assumed that the domain structure consists of very small number of domain walls responsible for magnetization process, which was confirmed by the visualization of static domain structure by a computer-controlled setup based on the Kerr effect.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 675-677
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Crystalline NiFe Alloy Prepared by High-Energy Ball Milling and Compacting
Autorzy:
Olekšáková, D.
Kollár, P.
Füzer, J.
Bednarčík, J.
Roth, S.
Powiązania:
https://bibliotekanauki.pl/articles/1533970.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.20.Wk
75.50.Vv
75.60.Ej
75.60.-d
Opis:
The structure and magnetic properties of compacted microcrystalline NiFe (81 wt% of Ni) powder is investigated. The powder of NiFe alloy prepared by ball milling of ribbon (prepared by melt spinning) remains single phase material suitable for compaction in order to prepare soft magnetic material. The bulk samples were consolidated by uniaxial compaction of the powder in vacuum. By measuring of AC and DC magnetic properties it was found out that in bulk samples the displacement of domain walls is the dominant magnetization process, while rotation of magnetization vectors prevails in powder material.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 797-799
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Film Thickness on the Microstructure and Magnetic Properties of Finemetic Thin Films
Autorzy:
Dlugoš, R.
Sovák, P.
Balcerski, J.
Füzer, J.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/2013050.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Jk
73.50.Jt
75.70.Ak
Opis:
The aim of this work was to study the influence of film thickness on the structure and magnetic properties of finemetic thin films after annealing. Thin films with the various thickness (from 20 nm up to 700 nm) were prepared by DC sputtering method. The heat treatments of the films for further structural and magnetic observations were performed at the temperature range 300-500°C for 15 min in vacuum furnace. Structural observations were carried out by transmission electron microscopy. Coercivity was determined from hysteresis loops traced with fluxmeter and Kerr magnetooptical hysteresisgraph. All the experimental results confirm a different magnetic behaviour of the thin films according to their thickness.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 447-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of Fe/$SiO_{2}$ Powder Composites Using Impregnation Method
Autorzy:
Kabátová, M.
Füzer, J.
Füzerová, J.
Dudrová, E.
Kollár, P.
Powiązania:
https://bibliotekanauki.pl/articles/1367476.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
77.84.Lf
75.60.Ej
Opis:
Fe/$SiO_{2}$ powder composite materials based on irregularly and/or spherically shaped iron powder particles with an addition of $SiO_{2}$ nanopowder were prepared in two ways, (i) by mixing the Fe/$SiO_{2}$ powder with 1.0 wt.% of Shellac dissolved in ethanol and (ii) by vacuum/pressure impregnation of low-temperature sintered Fe/$SiO_{2}$ components with shellac dissolved in ethanol and with thermoplast SL450. $SiO_{2}$ was implemented either as nanopowder or by sol-gel coating. Vacuum/pressure impregnation (VPI) of pre-sintered samples was performed in a steel container. The influence of iron particle shape and processing conditions on the electro-insulating layer was microscopically evaluated and correlated with the values of the electrical resistivity and coercivity. It has been found that the continuity, distribution and thickness of insulating phase is strongly controlled by the shape of iron particles. Using the VPI procedure, the irregular surface of iron particles may cause discontinuities of insulating layer, while the spherical iron particles are well covered with continuous evenly distributed insulating layer.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 134-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Preparation Methods on Magnetic Properties of Fe/SiO₂ Soft Magnetic Composites
Autorzy:
Füzerová, J.
Füzer, J.
Kollár, P.
Kabátová, M.
Dudrová, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032239.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
85.70.-w
81.05.Ni
Opis:
An analysis of several variants of the Fe/polymer/SiO₂ composites in terms of the impact of iron powder particle shape (irregular, spherical), of the content (0.4-2.0 wt%), of the polymer type (shellac, thermoset SL450) and the method of its application as well as the effect of the preparation procedure of the composites (mixing and/or vacuum-pressure impregnation) on properties of electrical insulating layer (thickness and coherence), electrical resistivity and magnetic properties was carried out. It was found that the main governing factor of the microstructure formation is the shape, surface microgeometry of the iron particles and the insulator layer. These determine not only the uniformity of thickness and cohesion of the insulating layer of the applied polymer or its hybrid modification (polymer+SiO₂ nanoparticles), but also the most suitable method of preparation in terms of the achieved values of electrical and magnetic properties of the composites.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 816-818
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isobaric Thermal Expansion and Isothermal Compression of Powdered NiFe Based Alloys Studied by In-Situ EDXRD
Autorzy:
Olekšáková, D.
Füzer, J.
Kollár, P.
Bednarčík, J.
Lathe, C.
Powiązania:
https://bibliotekanauki.pl/articles/1200812.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
61.05.cp
Opis:
The aim of the present work was to study the isothermal compression and isobaric thermal expansion behaviour of ball-milled NiFe (81 wt.% of Ni) and NiFeMo (79 wt.% of Ni, 16 wt.% of Fe) alloy and follow its phase evolution when exposed to high pressure and temperature. In-situ pressure-temperature energy dispersive X-ray (EDXRD) diffraction experiments were performed at the MAX80 instrument (beamline F2.1). The compressibility of NiFe alloy at 400 °C was evaluated for pressure values of up to 3.5 GPa. The EDXRD spectra revealed the presence of cubic FeNi_{3} phase as determined from the shift of (111), (200) and (220) reflection lines in corresponding EDXRD spectra.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 128-129
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Magnetic Properties of Vitroperm Based Composite Materials
Autorzy:
Kollár, P.
Hegedüs, L.
Füzer, J.
Bureš, R.
Fáberová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1533956.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
81.05.Ni
85.70.-w
75.60.-d
75.50.Bb
Opis:
The aim of this work was to investigate the influence of resin content on AC magnetic properties of Vitroperm 800-based composite material to extend possibilities for application of this kind of material at higher frequency (up to 100 kHz). The samples of composite material were prepared in the form of the ring with outer diameter of 25 mm, inner diameter of 18 mm and height approximately 3 mm. Powder mixtures were prepared from Vitroperm 800 in partial nanocrystalline state and commercial termoset resins by mechanical mixing. The AC magnetic properties (losses) at maximum induction up to 0.5 T were measured by MATS-2010SA loop tracer in frequency range 1-100 kHz. The specific resistivity of the material was measured by the van der Pauw method. The magnetic properties of the composite rings were compared with the properties of the material prepared from Fe based powder supported by Höganäs. It was found out that the total losses of the Vitroperm-based soft magnetic composite are more than 10 times lower (at 10 kHz) than that for Fe-based one.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 787-789
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advances in Powder Metallurgy Soft Magnetic Composite Materials
Autorzy:
Bureš, R.
Strečková, M.
Fáberová, M.
Kollár, P.
Füzer, J.
Powiązania:
https://bibliotekanauki.pl/articles/353238.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resin bonded SMC
soft magnetic ferrites
compaction
microwave sintering
magnetic and mechanical properties
Opis:
Powder metallurgy has grown with the expansion of various industry. Automotive industry had the most strong influence. Today, more than 90% of PM products are used in the transportation industry. Development of new materials such as magnetic materials is expected to meet the new trends of automotive industry, electric and hybrid vehicles. Soft magnetic composites (SMC) are PM materials based on ferromagnetic powder particles covered by electric insulation layer. Concept of SMC’s and PM technologies offer possibility to become faster, use higher frequencies, become smaller and denser, save more energy, achieving high permeability and lower core loss in high frequency region, which is required for soft magnetic materials. Investigation of correlations among compaction parameters, inner structure, magnetic and mechanical properties are presented.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1149-1154
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Soft Magnetic FeSi Composite Powder Cores
Autorzy:
Lauda, M.
Füzer, J.
Füzerová, J.
Kollár, P.
Strečková, M.
Fáberová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1367502.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
75.50.Bb
07.55.-w
Opis:
Soft magnetic composites (SMCs), which are used in electromagnetic applications, can be described as ferromagnetic powder particles surrounded by an electrical insulating film. These composite materials offer several advantages over traditional laminated steel cores such as reduction in weight and size. They have some unique properties, including three-dimensional isotropic ferromagnetic behaviour, very low eddy current loss, relatively low total core loss at medium and high frequencies, high electrical resistivity and good relative magnetic permeability. FeSi powder was used as a base ferromagnetic material for preparation of soft magnetic composites. The commercial FeSi particles of a precise spherical shape were prepared in two granulometric fractions (up to 150 μm or up to 356 μm). The phenol-formaldehyde resin modified by $SiO_{2}$ nanoparticles was used as an electroinsulating layer. The FeSi particles covered by the synthesized resin were compacted at 800 MPa into the ring samples for magnetic measurements. The final samples were treated thermally under the curing schedule, which was suggested according to thermal degradation of the modified resin.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 144-145
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wide Frequency Range AC Magnetic Properties of Fe-Based Composite Materials
Autorzy:
Kollár, P.
Birčáková, Z.
Füzer, J.
Füzerová, J.
Bureš, R.
Fáberová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1507025.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
85.70.-w
75.60.-d
75.50.Bb
Opis:
The aim of this work was to analyze the influence of resin content on contribution of the hysteresis, eddy current and anomalous losses to the total losses in the frequency range from DC to 150 kHz. The samples of composite material were prepared in the form of the ring with outer diameter of 25 mm, inner diameter of 17 mm and height approximately 3 mm and in the form of cylinder with diameter of 25 mm and height approximately 3 mm by a compaction of mixture of iron powder ASC100.29 (90 vol.%) and commercial termoset resins. The DC hysteresis losses were obtained by the measurements of DC hysteresis loops and the total power losses in the frequency range 0.4 Hz-150 kHz from AC hysteresis loops, both at maximum induction 0.05, 0.1 and 0.2 T. The magnetic properties of the composite rings were compared with the properties of the material prepared from the powder supported by Höganäs AB Sweden. By analyzing the frequency dependence of total losses of the Fe-based SMC we found out that hysteresis losses contribute to the total losses as a majority component.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 759-761
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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