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Tytuł:
Resonant State of 4f$\text{}^{14}\text{}^{/}\text{}^{13}$ Yb Ion in Pb$\text{}_{1-x}$Ge$\text{}_{x}$Te
Autorzy:
Grodzicka, E.
Dobrowolski, W.
Story, T.
Slynko, E. T.
Vygranenko, Yu.K.
Willekens, M. M. H.
Swagten, H. J. M.
de Jonge, W. J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1950801.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Ht
75.20.Ck
Opis:
The study of transport and of magnetic properties of Pb$\text{}_{1-x}$Ge$\text{}_{x}$Te:Yb mixed crystals (0 ≤ x ≤ 0.04) is reported. It is shown that Yb forms a donor state resonant with the PbTe valence band. The donor state position may be tuned (shifted relative to the energy gap) by admixture of Ge. The properties of the Yb ion in the Pb$\text{}_{1-x}$Ge$\text{}_{x}$Te matrix makes the system unique from the point of view of magnetic properties. It is demonstrated that the change of the conductivity type from p to n induces transitions from the paramagnetic state to the diamagnetic one.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 801-804
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Anisotropy in Eus-pbs Multilayers
Autorzy:
Story, T.
Swüste, C. H. W.
Swagten, H. J. M.
de Jonge, W. J. M.
Stachow-Wójcik, A.
Twardowski, A.
Arciszewska, M.
Dobrowolski, W.
Gałązka, R. R.
Sipatov, A. Yu.
Powiązania:
https://bibliotekanauki.pl/articles/2013042.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
75.70.Ak
Opis:
We present the results of ferromagnetic resonance studies of the thickness dependence of magnetic anisotropy in 2 series of EuS-PbS multilayers grown on (111) BaF$\text{}_{2}$ and (100) KCl substrates with the EuS thickness varying in the range d=6-70 Å. The anisotropy constant K was found to follow the dependence K(d)=K$\text{}_{V}$+2K$\text{}_{S}$/d , with the surface term K$\text{}_{S}$ larger for layers grown on BaF$\text{}_{2}$ as compared to KCl. This difference is discussed in terms of different thermal stress-induced distortions of cubic crystal lattice of EuS. We found that the thickness of EuS layer required for the perpendicular (to the layer) magnetization is d ≤ 2-3 Å, i.e., it is below 1 monolayer.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 435-438
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Structural Properties of EuS-PbS Multilayers Grown on n-PbS (100) Substrates
Autorzy:
Chernyshova, M.
Łusakowska, E.
Domukhovski, V.
Grasza, K.
Szczerbakow, A.
Wrotek, S.
Kowalczyk, L.
Story, T.
Smits, C. J. P.
Swagten, H. J. M.
De Jonge, W. J. M.
Palosz, W.
Sipatov, A. Yu.
Volobuev, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/2035589.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.30.Et
Opis:
Magnetic properties of semiconductor EuS(t)-PbS(d)-EuS(t) ferromagnetic trilayers (t=30÷300Å and d=7.5÷70Å) grown on n-type monocrystalline PbS (100) substrate were studied by SQUID magnetometry and ferromagnetic resonance technique yielding, in particular, the dependence of the ferromagnetic Curie temperature on the thickness of the EuS layer. Structural parameters of layers were examined by X-ray powder diffraction analysis. A high structural quality of the substrate and the multilayer was verified by the measurements of the X-ray rocking curve width indicating the values of the order of 100 arcsec and by atomic force microscopy revealing the presence on the cleft PbS surface regions practically flat in the atomic scale over the area of 1×0.1μm$\text{}^{2}$.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 609-615
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning Tunneling Spectroscopy Study of Surface States of 3d Metals: Chemical Identification, Magnetic Contrast and Orbital Kondo Resonance States
Autorzy:
Bischoff, M. M. J.
Fang, C. M.
de Groot, R. A.
Heijnen, G. M. M.
Katsnelson, M. I.
Kolesnychenko, O. Yu.
de Kort, R.
Lichtenstein, A. I.
Quinn, A. J.
Vasquez de Parma, A. L.
Yamada, T. K.
van Kempen, H.
Powiązania:
https://bibliotekanauki.pl/articles/2036891.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
68.37.-d
75.70.-i
Opis:
The surface states of 3d transition metals are studied by scanning tunneling microscopy and scanning tunneling spectroscopy. The results show that surface states can be used for chemical identification with high spatial resolution. The spin polarized nature of the surface states allows us to obtain magnetic contrast in scanning tunneling miroscopy imaging with near atomic resolution. For Cr(100) we found that the surface state close to the Fermi level can be explained by an orbital Kondo resonance surface state.
Źródło:
Acta Physica Polonica A; 2003, 104, 3-4; 231-243
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Transport and Magnetic Properties of La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Thin Films
Autorzy:
Baran, M.
Berkowski, M.
Fink-Finowicki, J.
Lewandowski, S. J.
Szymczak, H.
Szymczak, R.
Khartchev, S. I.
Medvedev, Yu. V.
Powiązania:
https://bibliotekanauki.pl/articles/2037109.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.-m
72.15.Gd
75.70.Pa
Opis:
The magnetic and transport properties of epitaxial La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ CuO$\text{}_{3}$ thin films deposited on SrLaGaO$\text{}_{4}$ substrate using dc magnetron sputtering technique are reported. The giant magnetoresistance effect (of about 50% at magnetic field of 1 T) was observed near the Curie temperature. Several mechanisms responsible for temperature dependence of resistivity are discussed. The effect of annealing was studied. It shifted the Curie temperature to the lower value, probably, because of the loss of oxygen.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 115-120
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:
Advanced Characterization of Material Properties on the Nanometer Scale Using Atomic Force Microscopy
Autorzy:
Fenner, M.
Wu, S.
Yu, J.
Huber, H.
Kienberger, F.
Powiązania:
https://bibliotekanauki.pl/articles/1490089.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.-g
07.79.-v
68.37.Ps
68.37.Uv
07.57.Pt
Opis:
We report recent advances in material characterization on the nanometer scale using scanning microwave microscopy. This combines atomic force microscopy and a vector network analyzer using microwave tip sample interaction to characterize dielectric and electronic material properties on the nanometer scale. We present the methods for calibration as well as applications. Scanning microwave microscopy features calibrated measurements of: (1) capacitance with attofarad sensitivity. For calibration a well characterized array of capacitors (0.1 fF to 10 fF) is used. The method is applied to determine the dielectric properties of thin organic films, (2) Semiconductor dopant density. Calibration is performed by imaging the cross-section of a standard sample with differently doped layers (dopant stair case) from $10^{16}$ atoms/$cm^3$ to $10^{20}$ atoms/$cm^3$.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 416-419
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exchange Bias in Ni-Mn-Sn Heusler Alloy Films
Autorzy:
Gościańska, I.
Załęski, K.
Głowiński, H.
Kudryavtsev, Yu.
Dubowik, J.
Powiązania:
https://bibliotekanauki.pl/articles/1427549.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
75.30.Et
Opis:
We report a relatively large exchange bias effect observed for the first time in Ni-Mn-Sn thin films with different microstructure and composition: a $Ni_{50}Mn_{36}Sn_{14}$ epitaxial film (A), a $Ni_{50}Mn_{43}Sn_7$ film which is phase decomposed (B), and a $NiMn//Ni_{50}Mn_{25}Sn_{25}$ bilayer (C). Despite the samples differ markedly in both microstructure and composition $H_{EB}$ does not substantially differs at 5 K. Exchange bias decreases with increasing T approximately as $H_{EB}$ (T) ∝ $H_{EB}$ (5K)/T with $H_{EB}$ (5K) of 180 Oe and 60 Oe for sample B and C, respectively and almost linearly for sample A with $H_{EB}$ (5K) = 65 Oe. Blocking temperature where the exchange bias vanishes is 40, 50 and 80 K for sample A, C and B, respectively. The results suggest that the role of AFM/FM interfaces is not substantial in formation of exchange bias in Ni-Mn-Sn Heusler alloy films and exchange bias is rather related to AFM/FM interactions in nanoscale.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1179-1181
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Characterization of Vanadate Laser Crystals
Autorzy:
Yu, H.
Zhang, H.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/1399465.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
42.55.Px
Opis:
Based on the invention and widely application of the Czochralski pulling method, vanadate crystals have been grown and commercialized in recent decades. In this paper, the growth and characterization of a series of neodymium doped vanadate crystals have been reviewed, including $Nd:YVO_4$, $Nd:GdVO_4$, and $Nd:LuVO_4$. The excellent thermal-mechanical and laser property make them to be used in many respects.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 301-304
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of float-sink and progressive release flotation of ground products of coal middlings
Autorzy:
Xie, W.
He, Y.
Luo, C.
Zhang, X.
Li, H.
Yu, J.
Wang, H.
Shi, F.
Powiązania:
https://bibliotekanauki.pl/articles/109500.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal middlings
float-sink
progressive release flotation
XPS
EDX
Opis:
An additional recovery of coking coal middlings can be utilized for increasing of the concentrate yield of coking coal. A combined flow sheet of comminution and flotation can realize this target. To investigate the effect of grinding process on further flotation of ground products, progressive release flotation tests were used to compare with the float-sink tests, which were regarded as a criterion. Coal middlings were ground by wet-milling with iron balls to <0.5 mm. Curves of ash vs. cumulative yields of sized products indicated that the concentrate yield of coal separated by progressive release flotation was lower than that of coal benefited by the float-sink test, with the same ash for four size fractions (0.5-0.25 mm, 0.25-0.125 mm, 0.125-0.074 mm and <0.074 mm). Distributions of elements conducted by energy disperse spectroscopy (EDX) showed that associated kaolinite was liberated and exposed on the surface. It led to the shift of local surface property from hydrophobicity to hydrophilicity. Meanwhile, analyses of chemical property performed by an X-Ray photoelectron spectrometer (XPS) depicted that the hydrophilic mineral FeOOH, which generated in the grinding process, was adsorbed on the coal surface. Flotation of the ground products were worsened due to the increase of hydrophilicity of the coal surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 675-684
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design method of winch driven by contactless magnetic coupling under deepwater
Autorzy:
Zhang, B.
Wang, Z.
Wang, T.
Yu, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/258870.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
magnetic coupling
winch
graph analysis
CAD
Opis:
Through the combination subject of scientific research, the design method of the winch driven by contactless magnetic coupling is researched for the core purpose of the turning shaft sealing in a deepwater environment. This method has six design phases, including domestic and foreign information query and retrieval, graphic analyses of relevant structures, innovative design of 2D assembly sketches, a theoretical computation of structure parameters, the 3D modeling and motion simulation and engineering drawing. This method is of generality, which can provide examples for the postgraduate students and engineering personnel in self-renovation design of scientific research.
Źródło:
Polish Maritime Research; 2015, S 1; 95-99
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design Of A Bi-Functional α-Fe2O3/Zn2SiO4:Mn2+ By Layer-By-Layer Assembly Method
Projektowanie dwufunkcyjnych proszków α-Fe2O3/Zn2SiO4:Mn2+ metodą warstwa po warstwie
Autorzy:
Yu, R.
Yun, J.
Pee, J-H.
Kim, Y.
Powiązania:
https://bibliotekanauki.pl/articles/352623.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
red pigment
α-Fe2O3
Zn2SiO4:Mn2+ layer
phosphor
bi-functional
czerwony pigment
Zn2SiO4: Mn2+
fosfor
proszki dwufunkcyjne
Opis:
This work describes the design of bi-functional α-Fe2O3/Zn2SiO4:Mn2+ using a two-step coating process. We propose a combination of pigments (α-Fe2O3) and phosphor (Zn2SiO4:Mn2+ ) glaze which is assembled using a layer-by-layer method. A silica-coated α-Fe2O3 pigment was obtained by a sol-gel method and a Zn2+ precursor was then added to the silica-coated α-Fe2O3 to create a ZnO layer. Finally, the Zn2SiO4:Mn2+ layer was prepared with the addition of Mn2+ ions to serve as a phosphor precursor in the multi-coated α-Fe2O3, followed by annealing at a temperature above 1000°C. Details of the phase structure, color and optical properties of the multi-functional α-Fe2O3/Zn2SiO4:Mn2+ were characterized by transmission electron microscopy and X-ray diffraction analyses.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1165-1167
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect Of The Desorption-Recombination Temperature On The Microstructure And Magnetic Properties Of HDDR Processed Nd-Fe-B Powders
Wpływ temperatury desorpcji-rekombinacji na mikrostrukturę i właściwości magnetyczne proszków Nd-Fe-B przetwarzanych metodą HDDR
Autorzy:
Lee, J.-G.
Cha, H.-R.
Liu, S.
Yu, J.-H.
Baek, Y.-K.
Kwon, H.-W.
Powiązania:
https://bibliotekanauki.pl/articles/353723.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nd-Fe-B
HDDR
permanent magnet
grain boundary
metoda HDDR
magnes trwały
granica ziarna
Opis:
The effect of the desorption-recombination temperature on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-B powders was studied. The NdxB6.4Ga0.3Nb20.2Febal (x=12.5-13.5, at.%) casting alloys were pulverized after homogenizing annealing, and then subjected to HDDR treatment. During the HDDR process, desorption-recombination (DR) reaction was induced at two different temperature, 810°C and 820°C. The higher Nd content resulted in enhanced coercivity of the HDDR powder, and which was attributed to the thicker and more uniform Nd-rich phase along grain boundaries. But this uniform Nd-rich phase induced faster grain growth. The remanence of the powder DR-treated at 820°C is higher than that DR-treated at 810°C. In addition, it was also confirmed that higher DR temperature is much more effective to improve squareness.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1499-1501
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional Properties and Electromagnetic Shielding Behaviour of Elastic Warp-knitted Fabrics
Właściwości funkcyjne i ekranowanie elektromagnetyczne elastycznych dzianin kolumienkowych
Autorzy:
Yu, Z. C.
He, H. L.
Lu, Y. H.
Zhang, J. F.
Lou, C. W.
Chen, A. P.
Lin, J. H.
Powiązania:
https://bibliotekanauki.pl/articles/232038.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
functional properties
electromagnetic shielding effectiveness
protective clothing
elastic warp-knitted fabric
electromagnetic wave
właściwości funkcjonalne
skuteczność ekranowania elektromagnetycznego
odzież ochronna
elastyczna osnowa-dzianina
fala elektromagnetyczna
Opis:
An investigation was made on the electromagnetic shielding behaviour and other functional properties for manufactured multifunctional elastic warp-knitted fabrics. Bamboo charcoal polyester/Crisscross-section polyester (BC-PET/CSP) blended yarns were used as the back of the warp-knitted fabric while conductive composite yarns were used as the front. The variation in the far infrared emissivity and anion density of elastic-warp knitted fabrics produced with different proportions of BC-PET content were studied in detail. Moreover the electromagnetic shielding effectiveness (EMSE) of the fabrics with different elongation was measured in this study. The experimental results showed that increased elongation almost did not significantly affect the EM shielding behaviour of fabric K1 in the elongation range of 0 - 40%. Finally to increase the EMSE of the fabric, the lamination method was used in this study. EMSE measurement results showed that two layer K1 warpknitted fabrics with 90° interval displayed a better shielding effect against the EM wave compared to that with a 0° interval.
Przeprowadzono badania właściwości ekranujących przed polem elektromagnetycznym i innych właściwości funkcyjnych wyprodukowanych wielofunkcyjnych elastycznych dzianin kolumienkowych. Zastosowano przędze kompozytowe z mieszanek zawierających drut ze stali kwasoodpornej, ciągłe włókna poliamidowe i poliestrowe oraz cięte włókna ze regenerowanej celulozy z surowca bambusowego. Badano emisyjność w dalekiej podczerwieni i gęstość anionową dzianin kolumienkowych wytworzonych przy rożnych proporcjach zastosowanych składników. Poza tym badano efektywność ochrony elektromagnetycznej dzianin przy rożnych wydłużeniach. Wyniki eksperymentów pokazują, że zwiększone wydłużenie prawie nie wpływa istotnie na właściwości ekranujące. Dla zwiększenia efektu ekranowania zastosowano metodę laminacji.
Źródło:
Fibres & Textiles in Eastern Europe; 2015, 5 (113); 78-83
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarization dependence of patterning effects in quantum well semiconductor optical amplifier-based wavelength conversion
Autorzy:
Qin, C
Shen, W
Zhao, J.
Yu, H.
Xu, E
Powiązania:
https://bibliotekanauki.pl/articles/173469.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
semiconductor optical amplifiers
polarization
patterning effect
Opis:
In this paper, polarization dependence of patterning effects in quantum well semiconductor optical amplifier-based wavelength conversion is experimentally and theoretically investigated. The carrier and photon density rate equations are numerically solved by using the time-domain traveling wave model. The material gain calculation, including the strain effect in the active layer, is based on the k·p method. By comparing experimental and computational results, it is demonstrated that the polarization of the injection signal has a significant influence on the gain recovery time of quantum well semiconductor optical amplifier. Under the cross-polarized signals injection, the output signals suffer the weakest and strongest patterning effects both for unstrained and tensile strained quantum well semiconductor optical amplifiers.
Źródło:
Optica Applicata; 2015, 45, 2; 163-172
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
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