Temat: 64.30.Jk - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Magnetic Equation of State and Transport Properties in Reduced Dimensions
Autorzy:: Warda, K.
Wojtczak, L.
Powiązania:: https://bibliotekanauki.pl/articles/1032847.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.30.Jk
64.60.-i
75.70.Cn
72.10.Fk
Opis:: Basing our considerations on magnetic equation of state applied to the description of magnetic systems of confined geometry we developed the model of calculations of the electrical resistivity for metallic multilayers. It was shown that in the transport of charge in ferromagnetic material d-electrons play an important role. The key parameters in the presented model are: the width of the electron energy band and the shift of the energy level for two spin orientations as well as the Fermi energy and size of the sample (the thickness of magnetic and nonmagnetic layers and the total number of layers). The presented results of calculations for temperature dependence of magnetoresistance are in qualitative agreement with the available experimental data. The model calculations introduced in this paper can be applied to current-in-plane geometry as well as to current-perpendicular-to-plane geometry. The calculations are valid within the limitations of the resistor network model.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 878-880
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Equation of State of Zircon-Type $TbVO_{4}$
Autorzy:: Minikayev, R.
Paszkowicz, W.
Werner-Malento, E.
Lathe, C.
Dąbkowska, H.
Powiązania:: https://bibliotekanauki.pl/articles/1538929.pdf
Data publikacji:: 2010-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.05.cp
62.50.-p
61.50.Ks
64.30.Jk
Opis:: High-pressure energy-dispersive X-ray diffraction study were performed on zircon-type phase of terbium orthovanadate, $TbVO_{4}$, in the pressure range up to 7 GPa. For analysis of the collected diffraction spectra, Le Bail refinements were performed. The values of bulk modulus and its pressure derivative ($B_0$ = 121 GPa, B' = 4.1) were obtained from fitting of the second-order Birch-Murnaghan equation of state. The equation of state derived for $TbVO_{4}$, is compared with earlier data based on the Raman spectroscopic studies and with data of several other rare-earth orthovanadates.
Źródło:: Acta Physica Polonica A; 2010, 117, 2; 319-322
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Experimental Evaluation of $CO_2//N_2$ Mixture Separation by Multi-multi-walled Carbon Nanotube
Autorzy:: Khalili, S.
Ghoreyshi, A.
Jahanshahi, M.
Davoodi, M.
Powiązania:: https://bibliotekanauki.pl/articles/1399700.pdf
Data publikacji:: 2013-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.46.Fg
64.75.Jk
66.30.Pa
Opis:: In order to examine the ability of multi-multi-walled carbon nanotube for $CO_2$ separation from flue gas, uptakes of $CO_2$ and $N_2$ were measured at temperatures of 288 K, 298 K and 308 K over the pressure range 1 to 40 bar using volumetric method. The experimental data was fitted by the Langmuir and Frendlich model isotherms. The same shape of isotherms introduced a common mechanism of adsorption but the amount of $CO_2$ adsorbed on multi-multi-walled carbon nanotube was 2.5 times higher than $N_2$ adsorption which indicated the possibility of $CO_2$ removal from flue gases using adsorption process with multi-multi-walled carbon nanotube as the adsorbent. Isosteric heat of adsorption was evaluated from a set of isotherms based on the Clausius-Clapeyron equation.
Źródło:: Acta Physica Polonica A; 2013, 123, 2; 230-232
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Magnetization Processes in Dilute Metamagnets with Ferro- and Antiferromagnetic Exchange Interactions
Autorzy:: Pikuła, R.
Kirkiewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/2046880.pdf
Data publikacji:: 2006-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.70.Jk
64.60.Kw
75.10.-b
75.30.Kz
Opis:: Using the Green function method there has been presented the mathematical description of dilute two sub-lattice metamagnets with ferro- and antiferromagnetic exchange interactions. The Green function averaging procedure is based on the Cumulant Expansion Technique and includes any localized Green function irrespectively of the decoupling algorithm making the chain system of equations self-consistent. The derived form of the averaged Green function is the base for the analysis of magnetization processes and phase transitions occurring in the system under the influence of external magnetic field. It has been found in particular that the tricritical point and the second-order phase transition vanish when concentrations of magnetic atoms coupled with different sub-lattice points become different.
Źródło:: Acta Physica Polonica A; 2006, 110, 1; 25-39
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Electric and Magnetic Properties of Hydrogels Doped with Cu Ions
Autorzy:: Coşkun, R.
Okutan, M.
Yalçın, O.
Kösemen, A.
Powiązania:: https://bibliotekanauki.pl/articles/1418231.pdf
Data publikacji:: 2012-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 52.25.Mq
82.35.-x
42.70.Jk
64.60.-i
76.30.-v
Opis:: The electric and magnetic properties of Cu doped and pure/undoped hydrogels were investigated by impedance spectroscopy and electron spin resonance techniques, respectively. The capacitance and dissipation factor (tan δ) were measured in the frequency range of 100 Hz-10 MHz at room temperature. The Cole-Cole plots for the Cu doped dry and pure dry hydrogels have been used to describe the characteristic change of electrical properties in mentioned temperature interval. The comparison between Cu ions doped and pure/undoped samples is done using the impedance spectroscopy and the electron spin resonance techniques. Electron spin resonance signal for pure, Cu doped wet and Cu doped dry samples are not any power absorption signal, near the symmetric with respect to the resonance field values according to the dry sample and asymmetric for resonance field/base line, respectively.
Źródło:: Acta Physica Polonica A; 2012, 122, 4; 683-687
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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