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Wyświetlanie 1-15 z 18
Tytuł:
Effect of Temperature and Time of Stress Annealing on Magnetic Properties of Amorphous Microwires
Autorzy:
Chichay, K.
Rodionova, V.
Ipatov, M.
Zhukova, V.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1387552.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.50.Cc
75.50.Kj
75.60.Ej
Opis:
In this work we studied influence of time and temperature of stress annealing on magnetic properties of amorphous Co-based and CoFeNi-based microwires. We showed that this type of treatment can be very effective for manipulation of magnetic properties of amorphous ferromagnetic glass-coated microwires. Co-based microwires keep S-shape hysteresis loop after any annealing. Annealing of Co-based microwires at different conditions allows tailoring of the saturation field. CoFeNi-based microwires present either S-shape or rectangular shape of the hysteresis loops depending on the value of the axial stress during the annealing. We demonstrated the possibility to change the switching field of microwires with acquired bistability in the range from 0.5 to 25 A/m.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 600-602
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ni_2FeSi Heusler Glass Coated Microwires
Autorzy:
Galdun, L.
Ryba, T.
Prida, V.
Hernando, B.
Zhukova, V.
Zhukov, A.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032750.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
72.20.Lp
Opis:
We report on fabrication, structural and magnetic properties of novel Heusler-type glass coated Ni₂FeSi microwires that were prepared by the Taylor-Ulitovsky method, having a metallic nucleus diameter about 3.9 μm and total sample diameter of 39 μm. This single step and low cost fabrication technique offers to prepare up to km of glass-coated microwires starting from few g of cheap elements for diverse applications. The X-ray diffraction data from the metallic nucleus indicates L2₁ crystalline structure (a=5.563 Å), with a possible DO3 disorder. Magnetic measurements determined the Curie temperature well above the room temperature (770 K) together with uniform easy magnetization axis of the metallic core, which predisposes this material to a suitable candidate for spintronic applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 851-853
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Study of Magnetization Process in Amorphous FeNiSiB Microwires
Autorzy:
Gamcova, J.
Varga, R.
Hernando, B.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1534004.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
75.60.Jk
Opis:
We have studied the magnetization process in amorphous $Fe_{49.6}Ni_{27.9}Si_{7.5}B_{15}$ microwire. It was found that the hysteresis mechanism consists of two contributions: magnetoelastic and structural relaxation. It was shown that at low frequencies, the magnetization process is controlled mainly by the structural relaxation. At higher frequencies (above 50 Hz), the relaxation effect disappears and switching field is determined mainly by the magnetoelastic contribution. Moreover, the effect of thermal treatment at temperature 300°C has been studied. As-cast microwire is almost unsensible to the applied tensile stress since the applied stresses are lower than that induced during production. After annealing, the stresses relax and stress sensibility of microwires increases.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 807-808
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Spins in Self-Assembled (In,Ga)As/GaAs Quantum Dots Studied by Pump-Probe Faraday Rotation
Autorzy:
Greilich, A.
Yugova, I. A.
Oulton, R.
Zhukov, E. A.
Yakovlev, D. R.
Bayer, M.
Shabaev, A.
Efros, Al. L.
Stavarache, V.
Reuter, D.
Wieck, A. D.
Powiązania:
https://bibliotekanauki.pl/articles/2046975.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.67.Hc
Opis:
Static and dynamic properties of electron spins in self-assembled (In,Ga)As/GaAs quantum dots which contain on average a single electron per dot were studied by pump-probe Faraday rotation. Examples given here are the g-factor tensor components as well as the dephasing time T*$\text{}_{2}$ within a dot ensemble.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 287-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy
Autorzy:
Mino, J.
Ipatov, M.
Gamcova, J.
Saksl, K.
Durisin, M.
Zhukova, V.
Vargova, Z.
Zhukov, A.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1030261.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
Opis:
Ribbons of composition Co₄₉Ni₂Ga₃₀ have been prepared by melt-spinning method. X-ray diffraction investigation revealed single phase with B2 structure at room temperature. However, analysis of magnetization dependence of temperature suggests phase transition in the range 150-250 K. Resistivity measurements revealed similar transition with shift to higher temperatures in the presence of magnetic field.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1075-1077
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Susceptibility Spectroscopy in FeNiSiB Microwires
Autorzy:
Olivera, J.
Gamcova, J.
Varga, R.
Santos, J.
Prida, V.
Sanchez, M.
Hernando, B.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813592.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Jk
Opis:
Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated $Fe_{77.5-x}Ni_xSi_{7.5}B_{15}$ (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 155-158
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and modeling of processes in the fluidized bed opposed jet mill
Autorzy:
Otwinowski, H.
Zhukov, V. P.
Wyleciał, T.
Belyakov, A. N.
Górecka-Zbrońska, A.
Powiązania:
https://bibliotekanauki.pl/articles/298345.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
fluidized bed opposed jet mill
grinding
classification
matrix model
selection function
cut size
Tromp curve
Opis:
A model of the grinding and classification processes in the fluidized bed opposed jet mill based on the Markov chains approach was proposed. The methodology of modelling was elaborated and experimental research of the combined processes of grinding and classification was carried out.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(4); 381-390
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Domain Wall Dynamics in Amorphous Microwires
Autorzy:
Richter, K.
Kostyk, Y.
Varga, R.
Zhukov, A.
Larin, V.
Powiązania:
https://bibliotekanauki.pl/articles/1813506.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.60.Jk
Opis:
Here we present the domain wall dynamics in FeNi-based microwires with positive magnetostriction. Two different ranges were found which differs by the measured domain wall mobility. At low fields, the domain wall dynamics exhibit small mobility, whereas at higher field the domain wall mobility increases. The difference in the two regimes of the domain wall dynamics is treated in terms of the different domain wall structure. At low fields, the transversal domain wall is expected, with low domain wall mobility. At high field, the vortex-type domain wall with high domain wall mobility is created.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 7-10
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Thermal Treatment on Domain Wall Dynamics in Glass-Coated Microwires
Autorzy:
Richter, K.
Varga, R.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1506966.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.60.Jk
Opis:
We have studied the effect of thermal treatment on amorphous glass-coated $Fe_{40}Si_{7.5}B_{15}$ microwires. This microwire is characterized by transverse domain wall regime only, with maximum domain wall velocity of about 1500 m/s. Annealing at 200°C slightly increases its transverse domain wall velocity, probably due to the reduction of mechanical stresses during the thermal annealing. Annealing at 300°C leads to drastical increase of domain wall mobility and domain wall velocity of the transverse domain wall up to 2500 m/s. Moreover, vortex regime appears in this case. Thanks to it, maximum domain wall velocity of around 5000 m/s was observed.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 738-739
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Characterization of $Co_2MnSi$ Heusler Microwires
Autorzy:
Ryba, T.
Vargova, Z.
Varga, R.
Kováč, J.
Zhukova, V.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368011.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Cc
75.30.Gw
Opis:
We report on the basic magnetic properties of glass-coated $Co_2MnSi$ Heusler microwires. Measurements of hysteresis loops in different directions show that easy magnetization axis coincides with the wire's axis. The frequency dependence of the coercive field has been measured at room temperature in the frequency range from 10 Hz to 10 kHz. The coercivity decreases with the frequency up to 100 Hz and then increases linearly up to 1 kHz.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 196-197
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependent Magnetic and Structural Properties of Ni-Mn-Ga Heusler Alloy Glass-Coated Microwires
Autorzy:
Shevyrtalov, S.
Chichay, K.
Ershov, P.
Khovaylo, V.
Zhukov, A.
Zhukova, V.
Rodionova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1387557.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Np
75.60.Ej
75.60.Nt
Opis:
We report on structural and magnetic properties of glass-coated microwires of Ni-Mn-Ga-based Heusler alloys. Structural characterization of the as-prepared microwires revealed that they have a cubic structure at room temperature. It is shown that magnetic properties of microwires can be tailored by heat treatment as well as by removing the glass coating. Specifically, annealing of the microwires has a marked influence of the Curie temperature $T_{C}$ which increases significatly in the heat-treated samples. Release of internal stresses in the microwires by removing the glass coating causes magnetization and the Curie temperature to decrease. This allowed us to conclude that in the studied microwires the magnetostriction constant is positive and estimate the value of internal stresses as being roughly equal to 1.5 GPa.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 603-605
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties and Giant Magnetoimpedance in Amorphous and Nanocrystalline Microwires
Autorzy:
Talaat, A.
Zhukova, V.
Ipatov, M.
Blanco, J.
Churyukanova, M.
Kaloshkin, S.
Kostitcyna, E.
Shuvaeva, E.
Gonzalez-Legarreta, L.
Hernando, B.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1200823.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
75.30.Gw
75.50.-y
Opis:
We studied magnetic properties and GMI effect of Finemet-type FeCuNbSiB microwires. We observed that GMI effect and magnetic softness of microwires produced by the Taylor-Ulitovski technique, can be tailored by either controlling magnetoelastic anisotropy of as-prepared FeCuNbSiB microwires or controlling their structure by heat treatment or changing the fabrication conditions. GMI effect has been observed in as-prepared Fe-rich microwires with nanocrystalline structure.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 146-147
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Negative Mobility of Single Domain Wall in Magnetic Microwires
Autorzy:
Varga, R.
Richter, K.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1506994.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.60.Jk
Opis:
Here, we present the domain wall dynamics in thin magnetic wires that exhibit even negative mobility regime. Such a regime is well below the Walker limit and is a result of structural relaxation. It disappears at high frequencies and it can be enhanced by application of mechanical stress. Moreover, the domain wall velocity was found to be almost field-independent at certain measuring conditions. Anyway, the domain wall velocity remains quite high (> 450 m/s) in this regime.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 747-748
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Luminescence and Absorption under Impurity Breakdown in Quantum Wells and Strained Semiconductor Layers
Autorzy:
Vorobjev, L.
Firsov, D.
Shalygin, V.
Panevin, V.
Sofronov, A.
Ustinov, V.
Zhukov, A.
Egorov, A.
Andrianov, A.
Zakhar'in, A.
Ganichev, S.
Danilov, S.
Kozlov, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813218.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.65.Fg
71.55.-i
71.55.Eq
73.21.Fg
73.61.Ey
78.55.Cr
78.66.-w
78.67.De
Opis:
We present the results of THz luminescence investigations in structures with Si-doped quantum wells and Be-doped GaAsN layers under strong lateral electric field. The peculiar property of these structures is the presence of resonant impurity states which arise due to dimensional quantization in quantum wells and due to built-in strain in GaAsN epilayers. The experimentally obtained THz emission spectra consist of the lines attributed to intra-center electron transitions between resonant and localized impurity states and to the electron transitions involving the subband states. Absorption of THz radiation and its temperature dependence was also studied in structure with tunnel-coupled quantum wells at equilibrium conditions and under electric field.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 925-928
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Engineering of Magnetic Properties of Magnetic Microwires
Autorzy:
Zhukov, A.
Ipatov, M.
Blanco, J.
Corte-León, P.
Olivera, J.
Gonzalez, J.
Zhukova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1029739.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.60.Jk
Opis:
We present an overview of the factors affecting soft magnetic properties, fast domain wall propagation and giant magnetoimpedance (GMI) effect in thin amorphous wires. The magnetoelastic anisotropy is one of the most important parameters that determine the magnetic properties of glass-coated microwires and therefore annealing can be very effective for manipulation the magnetic properties of amorphous ferromagnetic glass-coated microwires. Increasing of DW velocity in Fe-rich and Fe-Ni based (low Ni content) microwires is achieved after annealing. After heat treatment of Co-rich microwires we can observe transformation of inclined hysteresis loops to rectangular and coexistence of fast magnetization switching and GMI effect in the same sample. On the other hand stress annealing of Fe- and Co-rich microwires allows achievement of considerable magnetic softening and GMI effect enhancement.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 321-328
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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