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Tytuł:
Effect of Adding of V and Co Atoms on the Spin Glass Transition Temperature of Fe$\text{}_{0.7-x}$M$\text{}_{x}$Al$\text{}_{0.30}$ Alloys
Autorzy:
Azez, K. A.
Powiązania:
https://bibliotekanauki.pl/articles/2035747.pdf
Data publikacji:
2003-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
Opis:
Magnetization measurements on zero field cooled (M$\text{}_{ZFC}$) and field cooled (M$\text{}_{FC}$) with temperature T were made on Fe$\text{}_{0.7-x}$M$\text{}_{x}$Al$\text{}_{0.30}$ alloys (where M = Co or M = V). Compared to Co and V free alloy Fe$\text{}_{0.7}$Al$\text{}_{0.30}$, our results revealed that an addition of small amount of M = Co with 0≤ x≤0.10 shows linear decrease in the transition temperature T$\text{}_{f}$ as x increases. Addition of small amount of M = V with 0≤ x≤0.1 shows gradual decrease in T$\text{}_{f}$ with increasing x. The relative changes in T$\text{}_{f}$ show that an addition of V atoms is of more significance than addition of Co atoms. There is a twofold decrease which could be attributed to the ferromagnetic nature of Co atoms and to the random fields.
Źródło:
Acta Physica Polonica A; 2003, 103, 5; 471-476
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Al and Ga on Formation of the La(Fe,Si)_{13}-Type Phase in the LaFe_{11.14}Co_{0.66}Si_{1.2-x}M_x (where x=0.1, 0.2, 0.3; M=Al, Ga) Alloys
Autorzy:
Gębara, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398815.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work the influence of Al and Ga on formation of $La(Fe,Si)_{13}$-type phase in magnetocaloric $LaFe_{11.14}Co_{0.66}Si_{1.2-x}M_x$ (where x=0.1, 0.2, 0.3; M = Al, Ga) alloys subjected to annealing at 1323 K for 15 days was studied using the Mössbauer spectroscopy. For annealed samples, two crystalline phases were recognized: the dominant paramagnetic $La(Fe,Si)_{13}$-type phase, and minor fraction of ferromagnetic α -Fe(Co,Si). It was revealed that Al improved formation of 1:13 phase in contrast to Ga, which caused reduction of the ability of formation of the expected phase.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 193-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Alloy Admixture on Structure and Properties of rm $La(Fe, Co, Si)_{13}$-Type Phase
Autorzy:
Gębara, P.
Pawlik, P.
Škorvánek, I.
Marcin, J.
Wysłocki, J.
Szwaja, M.
Pawlik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1429027.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present study, the influence of Al and Ga admixture on the lattice parameters and the Curie point $T_{C}$ of the $La(Fe, Co, Si)_{13}$ compound was discussed. The measurements were carried out on ribbon samples of $LaFe_{11.0}Co_{0.8}Si_{1.2},$ $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ and $LaFe_{11.0}Co_{0.8}Si_{1.1}Ga_{0.1}$ alloys. The samples were subjected to annealing in the inert gas atmosphere at 1323 K for 24 h. The change of lattice parameters a with admixture of Al and Ga was determined from the X-ray diffraction analysis. Furthermore, changes of the Curie point with the alloy composition were observed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1285-1287
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of Magnetization Loop in Domain Wall Movement and Domain Rotation Contributions for Soft Magnetic Materials
Autorzy:
Varga, L.
Kovács, Gy.
Powiązania:
https://bibliotekanauki.pl/articles/1813593.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.60.-d
Opis:
The domain wall movement and magnetization rotations processes are separated experimentally in quasi-static magnetization process of a Finemet type ultrasoft magnetic material. The reversible domain rotations contribution is obtained from the integration of the reversible permeability, $μ_{DR}$, as a function of biasing DC field, measured with very small alternative field amplitude, less than 0.05 $H_c$. The domain wall movement component is obtained by the integration of the permeability obtained by extraction of $μ_{DR}$ from the differential permeability derived from one branch of the quasi-static major loop.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 159-162
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and Mössbauer Effect Study of Magnetic and Electronic Properties of Fe$\text{}_{3}$Al Compound
Autorzy:
Deniszczyk, J.
Frąckowiak, J. E.
Powiązania:
https://bibliotekanauki.pl/articles/1956205.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.10.Lp
Opis:
The electronic properties of Fe$\text{}_{3}$Al were determined experimentally, with the use of the Mossbauer spectroscopy, and theoretically. The band structure of the compounds was investigated applying the self-consistent tight-binding linear muffin tin orbital method. The calculated Fermi contact term of hyperfine fields and the isomer shifts are in good agreement with the values resulting from analysis of experimental data. The different kinds of electron transfer estimated on the base of the proposed "additive model" are also strongly supported by calculations.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 455-458
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomagnetic Properties of $LaFe_{11.0}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}$ (x=0, 0.6) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Skorvanek, I.
Marcin, J.
Pawlik, K.
Przybył, A.
Wysłocki, J.
Szwaja, M.
Filipecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1367677.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, Curie temperature, refrigeration capacity and cooling power of the $LaFe_{11.0}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}$ (where x=0, 0.6) alloys, are investigated. The value of Curie temperature was found to be 280 and 290 K for x=0 and 0.6, respectively. The determined values of cooling power (RCP) and refrigeration capacity (RC) differ only slightly for both investigated alloys. The maximum values of RCP and RC obtained under the change of external magnetic field from 0 to 5 T are 433 J/kg (for x=0) and 290 J/kg (for x=0.6), respectively.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 166-167
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the magnetization reversal processes in nanocrystalline Nd-Fe-B alloys doped by Nb
Autorzy:
Kaźmierczak, M.
Pawlik, P.
Wysłocki, J.
Wnuk, I.
Gębara, P.
Pawlik, K.
Przybył, A.
Powiązania:
https://bibliotekanauki.pl/articles/1052622.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the following article the magnetic properties and phase composition of (Nd₁₀Fe₆₇B₂₃)_{100-x}Nb_{x} (where x=5, 6, 7, 8, 9) alloys in the form of ribbons are discussed. The X-ray diffraction studies revealed the coexistence of amorphous and nanocrystalline structures consisting of Nd₂Fe₁₄B, Nd_{1+ε}Fe₄B₄ and metastable Nd₂Fe₂₃B₃ phases. The shape of M_{rev} (M_{irr}) suggests that the magnetization reversal proceeds through the nucleation of the reversal domain for the ribbon doped with 5-7 at.% of Nb and the subsequent pinning of the domain walls for ribbons doped with 8 and 9 at.% of Nb.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 789-791
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Critical Behavior in Gd₇₅Ge₁₅Si₅Ce₅ Alloy
Autorzy:
Gębara, P.
Hasiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1055116.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
The main goal of the present work was to study the critical behavior in the as-quenched Gd₇₅Ge₁₅Si₅Ce₅ (wt%) in the vicinity of the critical temperature T_{C}. The second order phase transition from a ferro- to a paramagnetic state was confirmed by the positive slope of the Arrott plots and analysis of temperature evolution of the Landau coefficients. The critical exponents have been revealed using the Kouvel-Fisher method and yield β=0.376±0.006, γ=1.032±0.006 and δ=3.835±0.008. The Curie temperature for the as-quenched Gd₇₅Ge₁₅Si₅Ce₅ equals 275.7±0.1 K.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1232-1235
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Magnetocaloric Study οf the $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ Alloy
Autorzy:
Gębara, P.
Pawlik, P.
Škorvánek, I.
Marcin, J.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1534407.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In this study, we have investigated the microstructure and magnetic entropy change of annealed $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ alloy in a form of bulk samples and melt-spun ribbons. The bulk samples were annealed at 1323 K for 20 and 49 days and the maximum values of the magnetic entropy change $| ΔS_M |$ obtained after the change of external magnetic field from 0 to 5 T reached 7.5 J $kg^{-1} K^{-1}$ and 7.7 J $kg^{-1} K^{-1}$, respectively. For the melt-spun ribbon annealed at the same temperature for 1 h, the maximum value of $| ΔS_M |$ reaches 4.5 J $kg^{-1} K^{-1}$. The temperature corresponding to the maximum entropy change increased from 292 K for bulk samples to 295 K for melt-spun ribbons. The lower values of the magnetic entropy change in the melt-spun $LaFe_{11.0}Co_{0.8}(Si_{0.4}Al_{0.6})_{1.2}$ are attributed to the presence of higher volume fraction of the secondary bcc-Fe phase in the ribbon samples.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 910-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Total Losses of Non-Oriented Electrical Steels
Autorzy:
Füzer, J.
Birčáková, Z.
Zeleňáková, A.
Hrubovčák, P.
Kollár, P.
Predmerský, M.
Huňady, J.
Powiązania:
https://bibliotekanauki.pl/articles/1535263.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.60.-d
Opis:
The aim of this work was to investigate the influence of microstructural features on the soft magnetic properties. The materials chosen for this work were two types of the Epstein strips of commercially produced non-oriented electrical steels by U.S. Steel Košice. The AC magnetic properties in 0.2-100 Hz frequency range were obtained by measurements of AC hysteresis loops by a fluxmeter based non-standard single sheet AC hysteresisgraph. The influence of the grain size and magnetic domains structure on the partial contributions (hysteresis, eddy current and anomalous) to the total losses is also discussed. The results of the frequency dependence of the total losses, measured by a single sheet loop tracer along the rolling direction and perpendicular to the rolling direction, show different contribution of partial components.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1018-1019
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Partial Substitution of Fe by Mn on the Thermomagnetic Properties of Magnetocaloric $LaFe_{11.2}Co_{0.7}Si_{1.1}$ Alloy
Autorzy:
Gębara, P.
Marcin, J.
Powiązania:
https://bibliotekanauki.pl/articles/1397028.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
The aim of this paper was to study the influence of partial substitution of Fe by Mn in the $LaFe_{11.2-x}Mn_{x}Co_{0.7}Si_{1.1}$ (where x=0.1, 0.2 and 0.3) alloys. Measurements revealed that a systematic increase of Mn in the alloy composition resulted in a decrease of the Curie temperature, which correlated with a decrease of the lattice parameter of the La(Fe,Si)₁₃- type phase. For samples corresponding to Mn content x=0.1 and 0.2 a decrease of magnetic entropy change was observed. However in the case of the sample with x=0.3 an increase of magnetic entropy change was detected.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 648-650
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of the Magnetic Phase Transition in the $LaFe_{11.14}Co_{0.66}Si_{1.1}M_{0.1}$ (Where M = Al or Ga) Alloys
Autorzy:
Gębara, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398280.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
The aim of the present work was to study the phase transition in the $LaFe_{11.14}Co_{0.66}Si_{1.1}M_{0.1}$ (where M = Al or Ga) alloys. Research was carried out using field dependences of magnetization measured at a wide temperature range. Positive slope of the Arrott plots showed that magnetic phase transition in both investigated samples was of second order nature. The temperature dependences of the Landau coefficients also revealed second order phase transition in both specimens. The analysis carried out using universal curve confirmed second nature of phase transition in both samples.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 798-800
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Ga Addition on Structure and Magnetic Properties of the $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x}$ (x=0.1, 0.2, 0.3) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Michalski, B.
Wysłocki, J.
Kotynia, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402328.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, the phase constitution and magnetic properties of the $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x}$ (where x=0.1, 0.2, 0.3) alloys, were investigated. It was revealed that increase of Ga content in the alloy composition causes the rise of lattice parameter of the $La(Fe,Si)_{13}$-type phase, which causes increase of the Curie temperature. However, the increase of Ga addition leads to decrease of magnetocaloric effect.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 87-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Magnetocaloric Effect in $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x}$ (x=0.1, 0.2, 0.3) Alloys
Autorzy:
Gębara, P.
Pawlik, P.
Michalski, B.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1387211.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.50.Bb
Opis:
In the present work, phase constitution and thermomagnetic properties of $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x}$ (where x = 0.1, 0.2, 0.3) alloys were investigated. Ingot samples were obtained by arc-melting under the low pressure of Ar atmosphere. Subsequently samples were annealed at 1323 K for 15 days. X-ray diffraction of all samples revealed coexistence of two crystalline phases dominant $La(Fe,Si)_{13}$-type and minor bcc α -Fe. Furthermore, the magnetic measurements at various temperatures allowed to study the Curie temperature, magnetic entropy changes and relative cooling power.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 576-578
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge and Spin Density Perturbation on Iron Nuclei by Non-Magnetic Impurities Substituted on the Iron Sites in α-Fe
Autorzy:
Błachowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811591.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
76.80.+y
Opis:
The paper is aimed at the review of the charge and spin density perturbation on the iron nucleus in the bcc iron-based binary alloys containing as the impurity either 4d (Nb, Mo, Ru, Rh, Pd) or 5d (Os, Ir, Au) metals. Additionally, Ga was used as such impurity as well. Measurements were performed by means of the $\text{}^{57}Fe$ transmission Mössbauer spectroscopy at room temperature. Powder X-ray diffraction data for alloys investigated show linear dependence of the lattice constant versus impurity concentration. The Mössbauer data were treated assuming random distribution of the impurity over the iron sites and additive effect for the charge density perturbation, and additive in the algebraic sense effect for the corresponding spin density perturbation. Hence, the effect of impurity depends solely on the distance between impurity and the iron nucleus under above assumptions. It has been found that impurities being further away than a third or in some cases as the second neighbor do not contribute directly to the charge and spin perturbation. On the other hand, they have usually some minor effect on the average charge and spin density. Generally, the perturbation to either charge or spin density has some oscillatory character versus distance from the impurity. The phase and period of the charge oscillation is vastly different from the phase and period of the spin oscillation in the majority of cases. Substitution of the impurities with the increasing number of 4d or 5d electrons leads to the lowering of the electron density on the iron nucleus and causes decreased band spin density on this nucleus. Subsequent impurities donate more and more d-type electrons to the band, and the latter screen more and more effectively s-like electrons. Hence, the density of the s-like electrons on the iron nucleus diminishes. Impurities with 5d electrons have generally stronger effect on the charge and spin density perturbation than impurities with 4d electrons.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1563-1571
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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