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Tytuł:
Temperature Dependence of the Viscosity of Isotropic Liquids
Autorzy:
Jadżyn, J.
Czechowski, G.
Lech, T.
Powiązania:
https://bibliotekanauki.pl/articles/2030494.pdf
Data publikacji:
2002-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
66.20.+d
83.85.Jn
Opis:
Temperature dependence of the shear viscosity measured for isotropic liquids belonging to the three homologous series: 4-(trans-4'-n-alkylcyclohexyl) isothiocyanatobenzenes (C$\text{}_{n}$ H$\text{}_{2n+1}$ CyHx Ph NCS; nCHBT, n=0÷12), n-alkylcyanobiphenyls (C$\text{}_{n}$H$\text{}_{2n+1}$ Ph Ph CN; nCB, n=2÷12) and 1,n-alkanediols (HO(CH$\text{}_{2}$)$\text{}_{n}$OH; 1,nAD, n=2÷10) were analysed with the use of Arrhenius equation and its two modifications: Vogel-Fulcher and proposed in this paper. The extrapolation of the isothermal viscosity of 1,n-alkanediols (n=2÷10) to n=1 leads to an interesting conclusion concerning the expected viscosity of methanediol, HOCH$\text{}_{2}$OH, the compound strongly unstable in a pure state.
Źródło:
Acta Physica Polonica A; 2002, 101, 4; 495-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Temperature Dependence of Domain Structure in Cobalt
Autorzy:
Szmaja, W.
Polański, K.
Dolecki, K.
Powiązania:
https://bibliotekanauki.pl/articles/1964829.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.-d
64.70.-p
Opis:
The type-I magnetic contrast in a scanning electron microscope is used to study the domain behaviour on the basal planes of cobalt monocrystals of different thicknesses during a heating cycle. Digital image processing is applied to the original scanning electron microscope images for their restoration, enhancement and analysis. The main reasons for the application of digital image processing are: low level of type-I magnetic contrast, particularly used at the higher temperatures, and the complex character of the magnetic domain structure. The changes in both domain structures and type-I magnetic contrast are due to the strong temperature dependence of magnetocrystalline anisotropy energy for the hcp phase of cobalt, which implies the rotation of magnetic easy axis from the c-axis to the basal plane. The temperature of the magnetic phase transition between an open-flux and a closed-flux domain configuration was found to be dependent on the specimen thickness. The changes in domain structure during the heating cycle were reversible under the condition that the specimen was not carried through the hcp-to-fcc phase transition. Otherwise, they were partially or completely irreversible and were caused by crystal imperfections originating from the transition. The paper shows the great advantage of using digital image processing system for data restoration, enhancement and analysis.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 469-472
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Photofield Emission from Tungsten ⟨001⟩ Direction
Autorzy:
Radoń, T.
Jaskólka, S.
Powiązania:
https://bibliotekanauki.pl/articles/1945415.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Bm
79.70.+q
71.25.Pi
Opis:
The existence of a minimum lying by 0.2 eV above the Fermi level, in the band structure of the ⟨001⟩ direction of tungsten, has been confirmed at temperatures of 600÷800 K of the emitter. With increasing temperature a slight rise of the Fermi level in relation to the band structure has been observed.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 665-668
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetization Damping in Heusler Alloy Films
Autorzy:
Dubowik, J.
Załęski, M.
Głowiński, H.
Gościańska, I.
Powiązania:
https://bibliotekanauki.pl/articles/1534143.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.50.+g
75.70.Ak
75.78.Jp
Opis:
The Gilbert damping for $Co_2CrAl (Co_2Cr_{0.3}Fe_{0.7}Al)$ and $Ni_2MnSn$ Heusler alloy films was investigated as a function of temperature. The best films reveals the Gilbert damping nearly independent of temperature. Magnetic relaxation in $Co_2CrAl$ is strongly influenced by magnetic inhomogeneities due to phase separation. The best $Ni_2MnSn$ epitaxial films have comparable Gilbert damping α of 6× $10^{-3}$ as half-metallic $Co_2Cr_{0.3}Fe_{0.7}Al$ films with α = 3 × $10^{-3}$.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 848-850
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Exchange Anisotropy of FeNi/FeMn Bilayers
Autorzy:
Żuberek, R.
Gutowski, M.
Szymczak, H.
Gnatchenko, S.
Merenkov, D.
Bludov, A.
Verkin, B.
Powiązania:
https://bibliotekanauki.pl/articles/1813596.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.Ac
75.30.Et
75.70.-i
76.50.+g
Opis:
The influence of the bilinear and biquadratic coupling on the exchange anisotropy of the ferromagnetic/antiferromagnetic bilayer was studied by variable angle and temperature dependent ferromagnetic resonance. From the angular dependence of the resonance field the bilinear and biquadratic exchange coupling constants were determined.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 167-170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetization Reversal of Thin Manganite Film
Autorzy:
Uspenskaya, L.
Nurgaliev, T.
Miteva, S.
Powiązania:
https://bibliotekanauki.pl/articles/1550567.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Hx
75.47.Lx
75.60.Jk
75.60.Lr
75.70.Ak
75.70.Kw
Opis:
The magnetic domain structure, its transformation with temperature, and the magnetization reversal in 20 nm $La_{0.7}Sr_{0.3}MnO_{3}$ film grown on $LaAlO_{3}$ substrate by off-axis magnetron sputtering at 700°C and post-annealed at 600°C were studied in a wide temperature range. The magnetic domains with either in-plane- or out-of-plane-orientation of the vector of spontaneous magnetization were observed in the same film depending on the prehistory. The domains with the in-plane magnetization were found to be more stable. Magnetization reversal of the film was shown to occur via the nucleation and motion of 180-degree head-to-head domain walls, the number and the type of which were found to be dependent on temperature. Moreover, the transition between two magnetization reversal regimes was found at 30 K.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 207-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of a Dielectric Relaxation in Weakly Polar Ferrofluids
Autorzy:
Rajňák, M.
Kurimský, J.
Dolník, B.
Cimbala, R.
Paulovičová, K.
Kopčanský, P.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032784.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Ch
77.22.Gm
82.70.Dd
Opis:
In this paper, we report on the temperature dependent broadband dielectric response of a ferrofluid based on transformer oil and magnetite nanoparticles covered with oleic acid molecules. For that purpose the method of dielectric spectroscopy has been chosen in the frequency range from 20 Hz up to 100 kHz. The experiments were carried out on thin film ferrofluid samples confined in a glass plate capacitor containing indium tin oxide (ITO) plate electrodes. The obtained complex permittivity spectrum shows a pronounced dielectric dispersion in the low frequency range. Taking into account the ferrofluid composition we associate this relaxation with ion impurity polarization at the nanoparticle-oil interface. The strong temperature dependence of the relaxation process has been found when conducting the experiments in the temperature range from 298 K to 358 K. The relaxation time of the revealed process exhibits a typical Arrhenius behavior. Based on the conducted experiments and analysis, we propose some reasonable practical applications of the studied ferrofluid in the field of electrical engineering.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 943-945
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared Lateral Photoconductivity of InGaAs Quantum Dots: the Temperature Dependence
Autorzy:
Moldavskaya, L. D.
Shashkin,, V. I.
Drozdov,, M. N.
Daniltsev, V. M.
Antonov, A. V.
Yablonsky, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/2036025.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
78.55.Cr
78.66.Fd
Opis:
We report the temperature dependence of lateral infrared photoconductivity in multilayer InGaAs/GaAs heterostructures with selectively doped quantum dots fabricated by metalorganic chemical vapor deposition. Two spectral lines of normal-inci dence intersubband photoconductivity (90 meV and 230 meV) and a line originating from interband transitions (930 meV) were observed. The photoconductivity line 230 meV is revealed up to the temperature 140 K. The long-wavelength photoconductivity line 90 meV is quenched rapidly at the temperature 30÷40 K owing to redistribution of photoexcited carriers between small and large dots. The obtained results confirm the hypothesis about bimodal distribution of quantum dot sizes.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 579-584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of the Switching Field in Nanocrystalline FeNiMoB Microwires
Autorzy:
Klein, P.
Varga, R.
Vazquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1366629.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
75.60.Jk
Opis:
We have studied temperature dependencies of the switching field in as-cast and nanocrystalline glass-coated $Fe_{40}Ni_{38}Mo_{4}B_{18}$ microwires. The switching field shows complex temperature dependence in the as-cast state reflecting the complex stress distribution induced during annealing. The temperature dependence of the switching field depends strongly on the stage of nanocrystallization being negative for low temperatures of annealing and positive for annealing at 700 K.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 64-65
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of temperature dependence of internal damping of selected magnesium alloys
Autorzy:
Oršulová, Tatiana
Palček, Peter
Uhríčik, Milan
Powiązania:
https://bibliotekanauki.pl/articles/111824.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
temperature dependence
internal damping
magnesium alloys
HIDAMETS
precipitate
stop magnezu
zależność temperaturowa
tłumienie wewnętrzne
Opis:
The research is focused on the study of the temperature dependence of the internal damping of selected magnesium alloys with different contents of aluminium - AZ31 and AZ61. These alloys are currently widely used in various types of industry, mainly in the automotive industry. It belongs to a group of materials called HIDAMETS because they have excellent damping properties. The internal damping of the samples was measured on a unique ultrasonic device constructed at Žilina University in Žilina. Specimens were measured at baseline in the temperature range from 25 °C to 400 °C. Changes in internal damping caused by varying aluminium contents in investigated alloys were noted. As the aluminium content increases, maximum internal damping is achieved due to the formation, growth and subsequent dissolution of the continuous precipitate in the microstructure.
Źródło:
Production Engineering Archives; 2019, 22; 7-10
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature dependence of cyclic behavior of poly (lactic acid)/hydroxyapatite nanocomposites
Autorzy:
Dusunceli, N.
Powiązania:
https://bibliotekanauki.pl/articles/285188.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposites
polymers
biodegradation
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 88
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Spin Hall Effect in k-Cubed Rashba Model
Autorzy:
Krzyżewska, A.
Dyrdał, A.
Berakdar, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030432.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Tj
72.25.-b
72.25.Mk
73.40.-c
Opis:
Within the Matsubara Green function formalism and linear response theory we considered theoretically the temperature dependences of the spin Hall effect for a two-dimensional gas with an isotropic k-cubed form of the Rashba interaction. We utilize a standard model for treating spin-orbit phenomena in p-doped semiconductor heterostructures and also for an electron gas formed at perovskite oxides interfaces.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 558-560
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of the Self-Broadened 540.06 nm Neon Line
Autorzy:
Leo, P. J.
Mullamphy, D. F. T.
Peach, G.
Venturi, V.
Whittingham, I. B.
Powiązania:
https://bibliotekanauki.pl/articles/1968841.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Jz
34.20.Cf
Opis:
Quantum close-coupled calculations of the collisional self-broadening of the 540.06 nm neon line (3s[3/2]$\text{}_{1}$-3p'[1/2]$\text{}_{0}$) are presented for temperatures from 70 K to 900 K. These calculations are based on the quantum-mechanical impact theory of Baranger and represent the interatomic interaction by adiabatic molecular potentials calculated using model potentials for the electron- atom and atomic core-core interactions. The calculated widths and shifts vary smoothly with temperature and are accurately given across the temperature range by fourth order polynomial fits.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 459-464
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Correlated Thermal Vibrations on Temperature Dependence of Surface Peak
Autorzy:
Gwizdałła, T.
Czerbniak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1943974.pdf
Data publikacji:
1996-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Mk
63.20.-e
Opis:
The influence of correlation between thermal displacements of atoms in string on the calculated Rutherford backscattering spectra under channelling conditions was studied. This correlation was incorporated into the existing Monte Carlo computer code by means of sampling the displacements from distribution transformed by the variance-covariance matrix. Various methods of implementing the correlation into calculation were used. As a result the deformation of energy spectrum was obtained. The explicit decrease in surface peak due to the correlation was observed. The significance of this effect decreases with increasing temperature. Calculation were performed in a wide region of temperatures, up to the melting point.
Źródło:
Acta Physica Polonica A; 1996, 89, 1; 61-67
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature dependence of polarization mode dispersion in tight-buffered optical fibers
Autorzy:
Borzycki, K.
Powiązania:
https://bibliotekanauki.pl/articles/308525.pdf
Data publikacji:
2008
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
single mode optical fiber
polarization mode dispersion
birefringence
environmental testing
tight buffered fiber
optical fiber cable
optical ground wire
temperature cycling
polymer
Opis:
Experiments and theoretical analysis of influence of temperature on polarization mode dispersion (PMD) in single mode optical fibers and cables are presented. Forces generated by contracting buffer create optical birefringence and increase fiber PMD at low temperatures. Single mode fiber (SMF) in 0.9 mm polymeric tight-buffer can exhibit an extra component of PMD exceeding 0.3 ps/?km in such conditions. On the other hand, tight-buffered spun nonzero dispersion-shifted fibers (NZDSF) and optical units with stranded single mode fibers have showed good stability of PMD over wide range of temperatures. This is due to presence of circular strain in the core, blocking accumulation of mechanically induced birefringence.
Źródło:
Journal of Telecommunications and Information Technology; 2008, 1; 56-66
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetisation Reversal and GMR in Spin Valve Structures
Autorzy:
Stobiecki, F.
Stobiecki, T.
Ocker, B.
Maass, W.
Powroźnik, W.
Paja, A.
Loch, C.
Röll, K.
Powiązania:
https://bibliotekanauki.pl/articles/2013156.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
68.55.Ln
68.55.-a
Opis:
Temperature measurements of magnetisation reversal, resistance and magnetoresistance of Co/Cu/Co/FeMn spin valve structures deposited in different conditions were performed. The influence of exchange anisotropy energy, interlayer coupling energy, and electron transport properties were taken into consideration in explaining differences in giant magnetoresistance effect of investigated samples.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 523-526
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Antiferromagnetic Interlayer Exchange Coupling in EuS-PbS Multilayers
Autorzy:
Chernyshova, M.
Kowalczyk, L.
Baran, M.
Szczerbakow, A.
Story, T.
Smits, C. J. P.
Filip, A. T.
Swagten, H. J. M.
de Jonge, W. J. M.
Sipatov, A. Yu.
Powiązania:
https://bibliotekanauki.pl/articles/2038129.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.30.Et
Opis:
Antiferromagnetic interlayer exchange coupling in semiconductor EuS-PbS-EuS ferromagnetic trilayers grown on PbS (001) substrates with ultrathin (0.6-1.2 nm) nonmagnetic PbS spacers is studied by SQUID magnetometry and model calculations. Analysis of the experimentally observed magnetic field and temperature dependence of the magnetization of EuS-PbS structures reveals a rapid decrease in the interlayer coupling energy with increasing temperature indicating a temperature dependence of the microscopic coupling mechanism acting in these all-semiconductor ferromagnetic/nonmagnetic multilayers.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 599-605
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The temperature dependence of subthreshold characteristics of Si and SiC power MOSFETs
Autorzy:
Kraśniewski, J.
Janke, W.
Powiązania:
https://bibliotekanauki.pl/articles/118323.pdf
Data publikacji:
2016
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
MOSFET
power transistor
subthreshold
temperature dependence
tranzystor mocy
obszar podprogowy
zależność od temperatury
Opis:
In the paper, subthreshold characteristics of Si and SiC MOSFET power transistors in a wide range of current and temperature are considered. Representative examples of measured iD-vGS dependencies for temperatures from 20°C up to over 140°C are presented and discussed. Substantial differences of the shapes obtained for Si and SiC devices are observed. The subthreshold slope and subthreshold swing coefficient are extracted from measured curves for two types of devices and compared.
W niniejszym artykule porównano charakterystyki w obszarze podprogowym tranzystorów mocy MOSFET z krzemu i węglika krzemu w szerokim zakresie prądu i temperatury. Dla reprezentatywnej partii tranzystorów przedstawiono i omówiono pomiary zależności iD-vGS w szerokim zakresie temperatur od 20°C do ponad 140°C. Dodatkowo zaprezentowano różnice w wartości nachylenia oraz wahania współczynnika w obszarze podprogowym od temperatury otoczenia dla badanych tranzystorów z Si i SiC.
Źródło:
Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2016, 9; 51-58
1897-7421
Pojawia się w:
Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of the Zero-Bias Conductance in the Graphene NIS Junction
Autorzy:
Wysokiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1374348.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.45.+c
73.23.Ad
Opis:
The temperature dependence of the zero-bias conductance of the graphene-based, ballistic junction composed of the three consecutive regions: normal, with potential barrier ("insulating") and superconducting (NIS), is analyzed within the extended Blonder-Tinkham-Klapwijk approach. Within this approach we have found that oscillatory behavior of the conductance as a function of barrier strength is suppressed by the temperature - the amplitude diminishes with heating up the junction. Moreover, the subtle, although nontrivial feature of the system is reported: the average over the period of the oscillations of the zero-bias conductance for relatively small Fermi level mismatch behaves non-monotonically with the increase of the temperature with the maximum roughly at T/$T_{c}$ ≈ 0.5.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-36-A-39
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence Analysis of Mode Dispersion in Step-Index Polymer Optical Fibers
Autorzy:
Kovacevic, M.
Djordjevich, A.
Powiązania:
https://bibliotekanauki.pl/articles/1795632.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.-i
42.81.Ht
42.81.Dp
Opis:
Temperature dependence of the mode dispersion is investigated for commercially available polymethyl methacrylate (PMMA) based step-index polymer optical fibers. An analytical expression is proposed describing the thermal variation of the fiber refractive index. This index decreases with increasing temperature as density of the polymer material drops. The study covered the temperature range from -60°C to 100°C. Results show that the modal dispersion decreases and the bandwidth increases with rising temperature.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 649-651
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetic Inelastic Neutron Scattering in Mn(12%Ge) Alloy
Autorzy:
Jankowska-Kisielińska, J.
Mikke, K.
Milczarek, J. J.
Hennion, B.
Udovenko, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/1956523.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.50.Ee
Opis:
A systematic study of temperature dependence of magnetic inelastic neutron scattering for itinerant antiferromagnet Mn(12%Ge) is presented. At low temperatures the experimental data are well described in terms of damped spin waves. This description becomes insufficient at least 150 K below T$\text{}_{N}$. In the temperature range 200-400 K the integrated intensity of distribution for energy transfer 13 THz increases by one third and the shape of the deconvoluted neutron scattering cross-section changes. These changes suggest that ca. 200 K below T$\text{}_{N}$ an additional contribution to the inelastic neutron scattering starts to appear and that its origin is different from spin waves.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 483-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetization in Transition Metal Ultrathin Films of Various Thicknesses
Autorzy:
Świrkowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1891839.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
76.80.+y
Opis:
Temperature dependence of the local magnetization in the spin-wave regime is calculated within the framework of the multiband model for ultrathin films consisting of 5, 7 and 9 monolayers. The temperature range in which the calculated results can be fitted to the Bloch T$\text{}^{3}$ $\text{}^{/}$ $\text{}^{2}$ law is found in all cases. The Bloch coefficient Bay corresponding to temperature dependence of the average film magnetization is found to be proportional to 1/D, where D is the thickness of the film. The spatial distribution of the local magnetization is obtained. The Bloch coefficient corresponding to the surface layer appears to be greater than the one corresponding to the central layer, namely B$\text{}_{s}$ > B$\text{}_{c}$. The ratio B$\text{}_{s}$/B$\text{}_{c}$ is increasing with an increase of the film thickness. The calculated results are well consistent with experimental ones obtained for ultrathin films of various thicknesses.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 689-697
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contactless Electroreflectance Study of Temperature Dependence of Fundamental Band Gap of ZnSe
Autorzy:
Krystek, W.
Malikova, L.
Pollak, F. H.
Tamargo, M. C.
Dai, N.
Zeng, L.
Cavus, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934065.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Fy
78.20.Wc
78.20.-e
Opis:
We report a systematic study of the temperature variation of the energy [E$\text{}_{0}$(T)] and broadening parameter [Γ$\text{}_{0}$(T)] of the fundamental band gap of ZnSe in the range 27 K < T < 370 K using contactless electroreflectance. The obtained values of E$\text{}_{0}$(T) and Γ$\text{}_{0}$(T) have been fit to various semi-empirical expressions to obtain information about the exciton-phonon coupling in this system. The experimentally determined E$\text{}_{0}$(T) also is of significance for technological applications since it can be used to determine the operating temperature of ZnSe-based devices such as quantum well lasers.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1013-1017
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetization Process in Bistable Amorphous and Nanocrystalline FeCoMoB Microwires
Autorzy:
Klein, P.
Varga, R.
Vazquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1534024.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 effect of thermal treatment on the magnetic properties of amorphous and nanocrystalline $Fe_{40}Co_{38}Mo_4B_{18}$ microwires. The magnetization process was measured within the temperature interval from 80 to 425 K. Microwires shows complex temperature dependence of the switching field in amorphous state due to the presence of complex stress distribution induced during production. After nanocrystallization, the switching field depends linearly on the measuring temperature that makes such microwires ideal for sensing applications.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 809-810
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature-dependence of cathodoluminescence of zinc oxide monolayers obtained by atomic layer deposition
Autorzy:
Witkowski, B S
Wachnicki, L
Nowakowski, P
Suchocki, A
Godlewski, M
Powiązania:
https://bibliotekanauki.pl/articles/173941.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
zinc oxide
cathodoluminescence
profiling
temperature-dependence
localization
Opis:
We performed cathodoluminescence (CL) investigations of zinc oxide monolayers obtained by atomic layer deposition. Layers of different thickness were deposited on commercial GaN/sapphire templates. Scanning electron microscopy (SEM) system equipped with CL allows direct comparison of SEM images and CL maps, taken from exactly the same areas of samples. In addition to SEM and CL images, CL profiling was performed by collecting the CL spectra at different accelerating voltages. The CL profiling allows to distinguish the emissions from a surface and volume of samples. An inter-link between samples microstructure and emission properties is investigated. Shifts of emission bands, associated by us with the localization effects, are observed. CL investigations are supported by photoluminescence (PL) measurements, which are characterized by a higher spectral resolution. PL investigations allow determination of the origin of emission bands.
Źródło:
Optica Applicata; 2013, 43, 1; 187-194
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
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