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    Wyświetlanie 1-9 z 9
    Tytuł:
    Nanoscale Analysis of Superparamagnetic Systems
    Autorzy:
    Chrobak, A.
    Ziółkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033082.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.-d
    76.80.+y
    Opis:
    The paper refers to a kind of nanoscale characterization of superparamagnetic materials above and below the so-called blocking temperature. It is propose to apply the Stoner-Wohlfarth model of nanoparticles magnetization supplemented by the two-level kinetic model, determining behavior in T>0. This approach allows determination of distribution of magnetic moments and energetic barriers of magnetic objects based on magnetization curves. In many cases, the determined distribution of magnetic moments can be recalculated into average size of the magnetic objects giving finally a nano/microscaled picture of the material. The proposed method was successfully used in characterization of diluted magnetics, nanocomposites, powders and even for human hemoglobin. In the paper the basic theory and its application to the nanoscale characterization is discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1371-1374
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of antisymmetric anisotropy on magnetisation of ultra-hard nanocrystalline alloys
    Autorzy:
    Ziółkowski, G.
    Chrobak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075870.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ww
    75.30.Gw
    75.50.Tt
    Opis:
    This paper describes an application of two-level Stoner-Wohlfarth model including antisymmetric anisotropy and two-level energetic model for simulations of magnetization processes in nanocrystalline, ultra-hard magnetic alloys. The simulation results have been compared with the experimental data obtained for the (Fe₈₀Nb₆B₁₄)_{0.88}Tb_{0.12} alloy. Moreover, the correctness of the proposed model was confirmed by the quantitative agreement with the direct Monte Carlo simulations of similar magnetic systems.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1137-1140
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Processes of Nanoparticles Embedded into Ferromagnetic Matrix
    Autorzy:
    Ziółkowski, G.
    Chrobak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387548.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.-d
    75.78.Cd
    Opis:
    The paper refers to computer simulations of interactions between magnetically hard particle embedded into ultra-hard matrix. We used simulated annealing and Monte Carlo simulations in a frame of the 3D Heisenberg model. The performed simulations reveal that the particles show additional exchange anisotropy dependent on "frozen" spin direction in the matrix and the angle between matrix and particle easy magnetization axes. The particle-matrix coupling are responsible for multi-phase magnetic hysteresis shape and exchange-bias like effect.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 597-599
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Stability of $(Fe_{80}Nb_{6}B_{14})_{0.9}Tb_{0.1}$ Bulk Nanocrystalline Magnet
    Autorzy:
    Chrobak, A.
    Ziółkowski, G.
    Randrianantoandro, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367802.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.d
    76.80.+y
    Opis:
    The paper refers to phase stability of the $(Fe_{80}Nb_{6}B_{14})_{0.9}Tb_{0.1}$ bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters d=2, 1.5, 1 and 0.5 mm. Heating up to 900 K reveals structural changes that occur at temperatures above 680 K (DSC and M(T) measurements). The phase analysis, using Mössbauer spectra, indicates the decrease of $Tb_{2}Fe_{14}B$ and increase of Fe content in the samples after the heat treatment. The most stable is the alloy with d=1 mm, where the formation of α-Fe phase was not observed. The decrease of d causes significant hardening i.e. coercive field increases from 0.57 T to 2.66 T for d=2 mm and d=0.5 mm, respectively.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 176-177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Cooling Rate on Magnetic Properties of $(Fe_{80}Nb_{6}B_{14})_{1-x}Tb_{x}$ Type of Bulk Nanocrystalline Alloys
    Autorzy:
    Chrobak, A.
    Ziółkowski, G.
    Haneczok, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367856.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.d
    76.80.+y
    Opis:
    The paper refers to magnetic properties of the $(Fe_{80}Nb_{6}B_{14})_{1-x}Tb_{x}$ (x=0.06 and x=0.08) bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters of d=1.5 mm, 1 mm and 0.5 mm. It was shown that for the alloys with x=0.08 the significant magnetic hardening with the decrease of sample diameter was observed. For d=0.5 mm the coercive field equals 2.46 T and the maximum energy product $|JH|_{max}$=77.2 kJ/$m^{3}$.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 178-179
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Structure and Magnetic Properties of Fe-Nb-B-Pt Type of Bulk Nanocrystalline Alloys
    Autorzy:
    Ziółkowski, G.
    Chrobak, A.
    Randrianantoandro, N.
    Klimontko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367778.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.76.80.+y
    Opis:
    The paper refers to magnetic and structure properties of the $(Fe_{80}Nb_{6}B_{14})_{1-x}Pt_{x}$ (x=0.15, 0.3, 0.4 and 0.6) bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters ranging from 0.5 mm to 1.5 mm. It was shown that the optimal Pt content is x=0.4 with the coercive field equal to 0.2 T and maximum energy product $|BH|_{max}=11.2 kJ//m^{3}$. The magnetic properties can be associated with Fe-Pt, Fe and Fe-B phases, depending on the alloy composition.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 174-175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size Effect of Hard Magnetic Properties of Fe-Nb-B-Tb Milled Alloys
    Autorzy:
    Granek, K.
    Ziółkowski, G.
    Chrobak, A.
    Klimontko, J.
    Talik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030390.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.d
    76.80.+y
    Opis:
    The paper refers to magnetic and structural properties of powders made of Fe-Nb-B-Tb ultra-high coercive alloy. The initial alloy was milled in a low energy mill for 1 h and 14 h. With increasing milling time we observed gradual deterioration of hard magnetic properties i.e. the coercive field decreases from 5.51 T to 0.14 T for the bulk alloy and 14 h milled powder, respectively. However, for the 1 h milling time the micrometric powder reveals quite high coercivity of 2.77 T which is promising for possible applications in magnetic composites.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 645-647
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of soft magnetic properties in Fe₈₂Nb₂B₁₄RE₂ (RE = Y, Gd, Tb and Dy) group of amorphous alloys
    Autorzy:
    Chrobak, A.
    Haneczok, G.
    Zivotsky, O.
    Hendrych, A.
    Kansy, J.
    Kotur, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1113556.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.-d
    76.80.+y
    Opis:
    Enhancement of soft magnetic properties in the selected group of amorphous alloys was examined by different experimental methods. It was shown that permeability for annealed samples (at T_{a} for 1 h; 300 K < T_{a} < 900 K) plotted vs. T_{a} shows a maximum at which is 700, 725, 725, and 750 K for Fe₈₂Nb₂B₁₄Y₂, Fe₈₂Nb₂B₁₄Gd₂, Fe₈₂Nb₂B₁₄Tb₂ and Fe₈₂Nb₂B₁₄Dy₂ alloy, respectively. For samples after the optimization annealing permeability is at least 10 times higher than in the as-quenched state. The optimized microstructure is free of iron nanograins and corresponds to so-called relaxed amorphous phase.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 916-919
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Transition and Rare Earth Elements on Magnetic Properties of Fe-Nb-B-M (M~=~Ni, Ag, Gd,~Tb) Bulk Nanocrystalline Alloys
    Autorzy:
    Ziółkowski, G.
    Randrianantoandro, N.
    Chrobak, A.
    Klimontko, J.
    Kądziołka-Gaweł, M.
    Haneczok, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428970.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    75.50.Tt
    75.60.-d
    76.80.+y
    Opis:
    In this work we present magnetic properties of the $(Fe_{80}Nb_6B_{14})_{1-x}M_x$ (where M = Ni, Ag, Gd, Tb and x = 0.08, 0.16, 0.32) bulk nanocrystalline alloys prepared by making use of mould casting technique. The applied preparation technique is favorable to nanocrystallization of the alloys with mean diameters of crystallites ranged from about 10 nm to 30 nm. Phase identification reveals a formation of ternary $RE_2Fe_{14}B$ and binary $REFe_2$ phases dependently on the alloy composition. It was found that for the alloys with Ag addition magnetic moment of Fe atom increases from 2.26 $μ_{B}$ to 3.36 $μ_{B}$ for x = 0.08 and x = 0.32, respectively. For Ni addition this quantity decreases with increasing x due to appearing of Fe-Ni (fcc) phases. For Gd, Tb additions the alloys are ferrimagnetic with compensation composition ranged between x = 0.08 and x = 0.16. The both rare earth alloying additions cause a significant magnetic hardening especially in the case of Tb.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1266-1269
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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