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Wyświetlanie 1-15 z 21
Tytuł:
Magnetism and Superconductivity in Nd$\text{}_{0.81}$Sr$\text{}_{0.19}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ Superlattices
Autorzy:
Komissarov, I.
Przysłupski, P.
Dłużewski, P.
Sawicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/2037112.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.78.Fk
75.70.Cn
Opis:
We report on the growth, structural and magnetic characterization of Nd$\text{}_{0.81}$Sr$\text{}_{0.19}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ (NSMO/YBCO) superlattices. The NSMO system for the doping level of x=0.19 is a ferromagnetic insulator. Multilayers with a fixed NSMO thickness of 13 unit cells and a varying YBCO layer thickness from 2 unit cells to 6 unit cells were sputtered on LaAlO$\text{}_{3}$ substrates. An onset of superconducting transition is seen starting from the multilayer with 3 unit cells of YBCO layer thickness. Hysteresis loops recorded above and below the superconducting transition show a signature of interlayer exchange coupling.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 127-132
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Some Properties of Carbon Nanotubes
Autorzy:
Byszewski, P.
Ukalski, K.
Baran, M.
Dlużewski, P.
Kozłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933400.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.-g
81.35.+k
Opis:
Carbon nanotubes can be grown in the DC electric arc, they grow covered by a turbostratic graphite. The mechanism of the tubes growth is discussed. The magnetic susceptibility of samples, which contained aligned nanotubes exhibits anisotropic oscillatory behavior, which is ascribed to spatial quantization of the energy levels.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 885-891
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Ferroelectric Properties of BiFeO₃/BaTiO₃ Heterostructures
Autorzy:
Aleszkiewicz, M.
Dybko, K.
Dynowska, E.
Dluzewski, P.
Przyslupski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398586.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.85.+t
77.80.-e
77.84.-s
77.84.Bw
Opis:
We report on preparation and electrical characterization of the epitaxial BaTiO₃ (BTO), BiFeO₃ (BFO) thin films and BFO/BTO bi- and multilayers, grown on (001) SrTiO₃ (STO) and $(LaAlO_3)_{0.3}(Sr_2TaAlO_6)_{0.7}$ (LSAT) substrates. The ferroelectric properties were characterized using the electric force microscopy method to image and switch the electric domains. This fabrication process opens the routes towards wide study of magnetoelectric effect in complex oxide heterostructures.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 511-515
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In Situ Electron Beam Amorphization of Sb₂Te₃ within Single Walled Carbon Nanotubes
Autorzy:
Marks, S.
Morawiec, K.
Dłużewski, P.
Kret, S.
Sloan, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033060.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.82.Rx
62.23.Hj
64.70.Nd
64.70.P-
61.80.Fe
61.72.Dd
61.48.De
Opis:
In this study, we reveal the crystallography, crystallinity, and amorphization of low-dimensional crystals of the topological insulator and phase change material Sb₂Te₃ within both discrete and bundled single walled carbon nanotubes with a diameter range spanning 1.3-1.7 nm by a combination of electron diffraction, aberration-corrected high resolution imaging, and variable dose electron beam irradiation. We further reveal that electron diffraction indicates that the crystallinity of the host single walled carbon nanotubes is largely unaffected by this process indicating that mass loss during the observed in situ glass transition had not occurred and that the template had maintained its structural integrity. Such a transition would not be possible with any other common nanoporous template for which the pores would be enlarged due to likely sintering.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1324-1327
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Properties of Co and CoFe Electrodes Forming a Magnetic Tunnel Junction
Autorzy:
Gładczuk, L.
Pankowski, P.
Paszkowicz, W.
Dłużewski, P.
Wójcik, M.
Przysłupski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2047237.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Hi
68.65.Ac
61.10.Nz
76.60.Lz
68.37.Lp
Opis:
The M$\text{}_{1}$/MgO/M$\text{}_{2}$ trilayer tunnel magnetoresistance systems are studied by means of X-ray diffraction, NMR, and transmission electron microscopy techniques. As M$\text{}_{1}$ and M$\text{}_{2}$ electrodes we used Co, Fe, and CoFe layers. The growth mechanism and structural quality of both electrodes and of the epitaxial MgO barrier forming the magnetic tunnel junctions are experimentally examined. It is shown that the crystallographic coherence of magnetic tunnel junctions across the MgO barrier is significantly disturbed by imperfect crystal structure of magnetic electrodes. The NMR results indicate a difference in short-range order between bottom and top electrodes.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 135-140
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Graphics Processing Unit for In-Line Electron Holography
Autorzy:
Morawiec, K.
Dłużewski, P.
Kret, S.
Szczepańska, A.
Li, T.
Sloan, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033020.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Lp
68.37.Og
68.55.Nq
42.30.Rx
61.05.jp
07.05.Pj
42.30.-d
42.30.Wb
Opis:
In the present work, software for exit electron wave reconstruction based on the iterative approach was implemented and a new method for drift-correction of the focal series was proposed.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1353-1356
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Native Deep-Level Defects in MBE-Grown p-Type CdTe
Autorzy:
Olender, K.
Wosiński, T.
Mąkosa, A.
Dłużewski, P.
Kolkovsky, V.
Karczewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1492964.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
68.37.Lp
61.72.J-
61.72.Lk
Opis:
Deep-level transient spectroscopy was used to study the defect levels in p-type CdTe layers grown by the molecular-beam epitaxy technique on lattice-mismatched GaAs substrates. In our measurements we have observed five hole traps. Two of the traps, displaying exponential capture kinetics, have been assigned to native point defects, the Cd vacancy and a complex formed of Cd vacancy and Te antisite, produced in the CdTe layers during their growth. The other two traps have been attributed to electronic states of threading dislocations on the ground of their logarithmic capture kinetics. The last trap, which was observed only when the investigated space charge region was close to the metal-semiconductor interface, has been ascribed to surface states.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 946-949
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconductivity and Magnetism in Nd$\text{}_{0.5}$Sr$\text{}_{0.5}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ Superlattices
Autorzy:
Tsarou, A.
Paszkowicz, W.
Minikayev, R.
Dłużewski, P.
Sawicki, M.
Przysłupski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2047250.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.78.Fk
75.70.Cn
Opis:
We report the synthesis and characterization of Nd$\text{}_{0.5}$Sr$\text{}_{0.5}$MnO$\text{}_{3}$/YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ superlattices. X-ray diffraction studies show that the superlattices are [001] oriented. We observe that the magnetic ground state of Nd$\text{}_{0.5}$Sr$\text{}_{0.5}$MnO$\text{}_{3}$ system in a multilayered structure is strongly dependent on the substrate.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 179-183
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System
Autorzy:
Barańska, M.
Dłużewski, P.
Kret, S.
Morawiec, K.
Li, Tian
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033003.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.jp
68.37.Lp
07.05.Pj
75.50.Pp
Opis:
The Lorentz off-axis electron holography technique is applied to study the magnetic nature of Mn rich nanoprecipitates in (Mn,Ga)As system. The effectiveness of this technique is demonstrated in detection of the magnetic field even for small nanocrystals having an average size down to 20 nm.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1406-1408
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron Photoemission Study of Ferromagnetic (Zn,Co)O Films
Autorzy:
Guziewicz, E.
Lukasiewicz, M.
Wachnicki, L.
Kopalko, K.
Dłużewski, P.
Jakiela, R.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1492604.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.At
75.50.Pp
81.05.Dz
81.15.Gh
Opis:
The electronic structure of ferromagnetic (Zn,Co)O films was investigated by resonant photoemission across the Co 3p → Co 3d photoionization threshold, e.g. using photon energy between 50 eV and 66 eV. The films were grown by atomic layer deposition at temperature between 160C and 300C and they differed in distribution and content of cobalt. The maximum of the Fano resonance was observed at photon energy 63 eV, whereas the minimum at 58 eV. The difference between energy distribution curves taken at 63 eV and the one taken at 58 eV was calculated for a series of samples. It shows that the Co 3d contribution to the valence band electronic structure of ferromagnetic (Zn,Co)O films differs significantly from that of the films which show the paramagnetic response.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-040-A-042
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MnAs Nanocrystals Embedded in GaAs
Autorzy:
Kwiatkowski, A.
Wasik, D.
Kamińska, M.
Twardowski, A.
Dłużewski, P.
Borysiuk, J.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811951.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.-g
75.75.+a
Opis:
Magnetic properties of MnAs nanocrystals embedded in GaAs are analyzed in the frame of phenomenological model proposed by Sasaki for ferritin superparamagnets. Our calculations explain qualitatively experimental data of magnetization versus temperature, obtained according to zero-field-cooled and field-cooled protocols. They show dynamics of magnetization of MnAs nanocrystals in range of temperature from 10 K to 320 K. There is transition from state in which very slow dynamics is observed (frozen state) to state in which dynamics is fast (quasi-superparamagnetic state).
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1207-1211
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrathin Niobium in the Si/Nb/Si Trilayers
Autorzy:
Zaytseva, I.
Abal'oshev, O.
Dłużewski, P.
Minikayev, R.
Cieplak, Marta
Zhu, L.
Chien, C.
Powiązania:
https://bibliotekanauki.pl/articles/1374193.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.-w
74.70.Ad
74.25.-q
Opis:
We study magnetotransport properties of the Si/Nb/Si trilayers, in which the thickness of niobium, d, changes from 1.1 nm to 50 nm, while the thickness of Si is fixed at 10 nm. The niobium films are amorphous for d < 4 nm, while in thicker films the alligned polycrystalline grains are formed. We observe that the Hall coefficient changes sign into negative in the films with d < 1.6 nm. We also find that in the ultrathin films the magnetic field induces a transition from the superconducting into a metallic phase with the resistance smaller than the normal-state resistance.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-140-A-144
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of GaN Nanocolumns Grown by Plasma - Assisted MBE on Si (111) Substrates
Autorzy:
Zytkiewicz, Z.
Dluzewski, P.
Borysiuk, J.
Sobanska, M.
Klosek, K.
Witkowski, B.
Setkiewicz, M.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1492480.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Hi
81.05.Dz
61.46.Km
Opis:
We report on growth of GaN nanocolumns by plasma assisted MBE on (111) silicon substrates and on their characterization. The nanocolumns nucleate on the substrate spontaneously without use of any catalyst, probably by the Volmer-Weber mechanism. Transmission electron microscopy analysis shows high crystalline quality of GaN nanocolumns and their good alignment with the c-axis being perpendicular to the substrate. Preliminary results on use of GaN nanocolumns in gas sensor devices are presented.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-015-A-016
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoresistance of Si/Nb/Si Trilayers
Autorzy:
Zaytseva, I.
Cieplak, M.
Abal'oshev, A.
Dluzewski, P.
Grabecki, G.
Plesiewicz, W.
Zhu, L.
Chien, C.
Powiązania:
https://bibliotekanauki.pl/articles/1537220.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.62.-c
74.25.F-
74.25.Ha
74.62.En
Opis:
We study the superconductor-insulator transition in Si/Nb/Si trilayers, in which the thickness of Si is fixed at 10 nm, and the nominal thickness of Nb changes in the range between d = 20 nm down to d = 0.3 nm. The transmission electron microscopy indicates the formation of the mixed Nb-Si layer for small d. Both the thickness-induced, and the magnetic-field induced superconductor-insulator transition is observed. The crossing point of the isotherms at the critical field $B_{c}$ decreases with decreasing d, and it is T-independent at temperatures below 300 mK. At larger fields the weak peak in magnetoresistance appears in some of the films.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 406-408
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Structural Study of (ZnTe)/Co Core-Shell Nanowires Grown by Molecular Beam Epitaxy
Autorzy:
Misiuna, P.
Dłużewski, P.
Wojciechowski, T.
Lewińska, S.
Ślawska-Waniewska, A.
Wawro, A.
Wiater, M.
Wojtowicz, T.
Baczewski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1386894.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Km
75.30.Gw
75.75.+a
Opis:
Arrays of crystalline ZnTe nanowires grown by vapor-liquid-solid mechanism were covered with cobalt in a molecular beam epitaxy system. Magnetic and structural characterization of such core/shell nanowires was performed. Using scanning electron microscopy and transmission electron microscopy it was found that the mean shell thickness of cobalt was about 35% of the nominal deposition thickness. Deposited cobalt had a polycrystalline structure covering the ZnTe nanowires evenly along their length. With the increment of temperature during Co deposition the roughness of the nanowire sidewalls increases. Vibrating sample magnetometry measurements revealed that the magnetization easy-axis direction is perpendicular to the long axis of the nanowires, which is in agreement with theoretical predictions. Oxidation of Co shell does not change the anisotropy direction of such structures, however it increases their coercivity. Exchange bias effect at the interface of cobalt and cobalt oxides suggested by some authors is not responsible for such anisotropy orientation.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 517-519
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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