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    Wyświetlanie 1-14 z 14
    Tytuł:
    Microstructure and Magnetic Properties of Magnetron-Sputtered [Fe/Pt]ₙ Multilayer Films
    Autorzy:
    Zhang, Y.
    Yu, W.
    Chen, F.
    Liu, M.
    Li, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401879.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    75.50.Ss
    Opis:
    [Fe/Pt]ₙ multilayer films were prepared on thermally oxidized Si (100) substrates at 300°C using dc magnetron sputtering and annealed for different temperature ranging from 350 to 500°C. It is found that the as-deposited [Fe/Pt]ₙ multilayer films exhibit well-resolved periodic structures and low roughness of interface. The ordering degree of the annealed films decreases and their perpendicular magnetic anisotropy deteriorates with increasing the period number. Fe/Pt bilayer film annealed at 350°C shows (001) orientation and hard magnetic characteristic, the coercivity and perpendicular anisotropy enhance with increase of annealing temperature. In addition, the hard and soft magnetic phases are not fully magnetically coupled in the Fe/Pt film annealed at higher temperature.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 326-330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication, Structural Characterization and Optical Properties of the Flower-Like ZnO Nanowires
    Autorzy:
    Feng, L.
    Liu, A.
    Ma, Y.
    Liu, M.
    Man, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538755.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    81.05.Dz
    81.10.Aj
    Opis:
    Multipod flower-like zinc oxide (ZnO) nanowires have been successfully synthesized on Si(111) substrates using a pulsed laser deposition prepared Zn film as "self-catalyst" by the simple thermal evaporation oxidation of the metallic zinc powder at 850°C without any other catalysts or additives. The pre-deposited Zn films by pulsed laser deposition on the substrates can promote the formation of the ZnO nuclei effectively. Also it can further advance the growth of the flower-like ZnO nanowires accordingly. X-ray diffraction, scanning electron microscope, high-resolution transmission electron microscopy, Fourier transform infrared spectrum, and photoluminescence were used to analyze the structure, morphology, composition and optical properties of the as-synthesized products. The results demonstrate that the nanowires were single crystalline with hexagonal wurzite structure, grown along the [0001] in the c-axis direction. Room temperature photoluminescence spectrum of the ZnO nanowires shows a nearband-edge ultraviolet emission (peak at ≈ 384 nm) and a deep-level green emission (peak at ≈ 513 nm). In addition, the growth mechanism of the flower-like ZnO nanowires is discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 512-517
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Heat Flux Testing of Doped and Coated Graphite Using High-Intensity Pulsed Ion Beam
    Autorzy:
    Zhu, X.
    Liu, C.
    Lei, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807981.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    28.52.Fa
    52.59.Mv
    81.05.Uw
    Opis:
    A high-intensity pulsed ion beam (HIPIB) technique is applied to heat flux testing of plasma facing materials for fusion experiment. The HIPIB is generated at a relatively stable power density up to $10^{8}$ W/$cm^{2}$, which covers a heat flux parameter of up to several hundreds MW $m^{-2} s^{1//2}$. Surface morphology and weight loss are examined for doped and coated graphite with HIPIB exposure of 280 MW $m^{-2} s^{1//2}$, being of the same order of thermal loads during off-normal events in future fusion reactors. The work demonstrates a first example utilizing the HIPIB technique to study thermal response of plasma facing materials under fusion relevant thermal loads.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1177-1179
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XANES Study of La$\text{}_{0.75-x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$ Solid Solutions
    Autorzy:
    Drozd, V. A.
    Pęka̶a, M.
    Liu, R. S.
    Lee, J.-F.
    Chen, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046755.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    61.10.Ht
    Opis:
    A series of solid solutions La$\text{}_{0. 75-x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$ with 0.0≤x≤0.75 was prepared via carbonate precursor precipitation method. Final sintering was performed at 1250ºC in oxygen flow atmosphere. The samples obtained were characterized by scanning electron microscope, X-ray diffraction measurements. Oxygen stoichiometry was analyzed by iodometric titration method. X-ray absorption spectroscopic methods of Mn L-edge and Mn K-edge X-ray absorption near edge structure were used to study oxidation state of manganese in the solid solutions and elucidate features of their local crystal structure. Orthorhombic crystal structure characteristics of the solid solutions were refined by Rietveld method. An increase in oxygen deficiency and average manganese oxidation state were found to accompany Gd concentration increase in La$\text{}_{0.75-x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$. These results are consistent with Mn L-edge X-ray absorption near edge structure spectra, where a gradual change of Mn oxidation state with Gd concentration increase was detected. Origins of oxygen deficiency La$\text{}_{0.75- x}$Gd$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3-δ}$ are discussed in terms of structural disorder caused by Gd substitution for La.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 583-589
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth of Pt-Ni nanoparticles of different composition using electrodeposition and characterization of their magnetic properties
    Autorzy:
    Kožejová, M.
    Hložná, D.
    Hua Liu, Y.
    Ráczová, K.
    Čižmár, E.
    Orendáč, M.
    Komanický, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1053087.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.+a
    75.75.Fk
    82.45.Qr
    68.37.Hk
    Opis:
    We prepared Pt₃Ni and PtNi₃ nanoparticles of various sizes on conductive and atomically smooth highly oriented pyrolytic graphite surfaces using potentiostatic electrodeposition. We can control the size of electrodeposited nanoparticles and their density on the surface by changing the deposition time. The morphology of nanoparticles was determined by scanning electron microscopy. PtNi₃ particles have spherical shape, while Pt₃Ni particles have more irregular shape. Composition of particles was confirmed by energy dispersive spectroscopy. We have measured magnetic properties of both systems with 100 s preparation time, superparamagnetic behavior was observed in PtNi₃ nanoparticles with blocking temperature T_{B}=225 K.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 839-841
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acquisition of the Surface Morphology of Ruled Gratings with a Microscope Objective
    Autorzy:
    Li, Z.
    Ma, L.
    Liu, C.
    Zhang, M.
    Chen, X.
    Cheng, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189791.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.30.Kq
    42.87.-d
    42.79.Dj
    42.40.Kw
    Opis:
    In this paper, an optical microscope objective with large numerical number is inserted into a Mach-Zehnder interferometer, and this system is adopted to detect the surface morphologies of two ruled transmission gratings with area scale to a micrometer. The object waves transmitting from the gratings interfere with spherical reference wave, and the interferograms constructed are recorded by a high-resolution CCD. The surface maps of the gratings are retrieved from the interferograms, and the results are confirmed by the measurement with an atomic force microscope, with detection errors in nanometer scale. This work provides an optical non-destructive method for precise detection of small-area sophisticated object surfaces with an optical microscope objective.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1630-1633
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Coupling in Magnetic Semiconductor Multilayers and Superlattices
    Autorzy:
    Furdyna, J.
    Leiner, J.
    Liu, X.
    Dobrowolska, M.
    Lee, S.
    Chung, J.
    Kirby, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426668.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    61.05.fj
    75.47.De
    75.70.Cn
    Opis:
    The study of ferromagnetic semiconductors continues to be of great interest because of their potential for spintronic devices. While there has been much progress in our understanding of ferromagnetic semiconductor materials - particularly of the canonical III-V system $Ga_{1-x}Mn_xAs$ - many issues still remain unresolved. One of these is the nature of interlayer exchange coupling in GaMnAs-based multilayers, an issue that is important from the point of view of possible spintronic applications. In this connection, it is important to establish under what conditions the interlayer exchange coupling between successive GaMnAs layers is antiferromagnetic or ferromagnetic, since manipulation of such interlayer exchange coupling can then be directly applied to achieve giant magnetoresistance and other devices based on this material. In this review we will describe magneto-transport, magnetization, and neutron reflectometry experiments applied to two types of GaMnAs-based multilayer structures - superlattices and tri-layers - consisting of GaMnAs layers separated by non-magnetic GaAs spacers. These measurements serve to identify conditions under which AFM coupling will occur in such GaMnAs/GaAs multilayer systems, thus providing us the information which can be used for manipulating magnetization (and thus also giant magnetoresistance) in structures based on the ferromagnetic semiconductor GaMnAs.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 973-980
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Nb Content on the Thermal, Structural, and Magnetic Properties of FeNbB Ribbons
    Autorzy:
    Hua, Z.
    Zuo, B.
    Li, M.
    Wang, X.
    Wang, L.
    Liu, J.
    Wang, D.
    Dong, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365063.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    61.43.Dq
    Opis:
    Amorphous $Fe_{80-x}Nb_{x}B_{20}$ (x = 5, 10, 15) ribbons were prepared by single-roller melt spinning method. The thermal, structural and magnetic properties of $Fe_{80-x}Nb_{x}B_{20}$ (x = 5, 10, 15) ribbons were investigated using differential thermal analysis, X-ray diffraction, and vibrating sample magnetometer. The thermal stability is the lowest for $Fe_{70}Nb_{10}B_{20}$ ribbon and the highest for $Fe_{65}Nb_{15}B_{20}$ ribbon. Along with the increase of Nb content, the supercooled liquid region Δ $T_{x}$ increases, indicating that the amorphous formation ability improves. The primary stages of crystallization of the three ribbons are different. The primary devitrification phases are $Fe_{23}B_6$ type for $Fe_{70}Nb_{10}B_{20}$ and $Fe_{75}Nb_5B_{20}$ ribbons, and α-Fe type for $Fe_{65}Nb_{15}B_{20}$ ribbon. $Fe_{80-x}Nb_{x}B_{20}$ (x = 5, 10) ribbons are ferromagnetic and the $Fe_{65}Nb_{15}B_{20}$ ribbon is paramagnetic. The saturation magnetization ($M_{s}$) decreases with increasing Nb content.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1149-1151
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and Magnetic Properties of Low Temperature Annealed Ga$\text{}_{1-x}$Mn$\text{}_{x}$As
    Autorzy:
    Kuryliszyn, I.
    Wojtowicz, T.
    Liu, X.
    Furdyna, J. K.
    Dobrowolski, W.
    Broto, J.-M.
    Goiran, M.
    Portugall, O.
    Rakoto, H.
    Raquet, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035604.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.50.Dd
    81.40.Rs
    Opis:
    We present the results of low temperature annealing studies of Ga$\text{}_{1-x}$Mn$\text{}_{x}$As epilayers grown by low temperature molecular beam epitaxy in a wide range of Mn concentrations (0.01
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 659-665
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoelectron Emission Microscopy and its Application to the Study of Polymer Surfaces
    Autorzy:
    Cossy-Favre, A.
    Diaz, J.
    Anders, S.
    Padmore, H.
    Liu, Y.
    Samant, M.
    Stöhr, J.
    Brown, H.
    Russell, T. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964108.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ms
    73.61.Ph
    64.75.+g
    Opis:
    The X-ray photoelectron emission microscopy at the Advanced Light Source has a spatial resolution of 0.2 microns at an accelerating voltage of 12 kV. The tunability of the photon energy is used to provide chemical state information using near edge X-ray absorption fine structure spectroscopy on the sub-micrometer scale. The homogeneity of thin films of polymer blends was studied for various film thicknesses. The polystyrene/polyvinylmethylether film of 194 Å showed protrusions of 2-3 μm diameter with an enriched polystyrene content while the polystyrene/polystyreneacrylonitrile 504 Å thick films showed 5-6 μm segregated regions without any topological structure.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 923-927
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scanning-Gate Microscopy of Semiconductor Nanostructures: An Overview
    Autorzy:
    Martins, F.
    Hackens, B.
    Sellier, H.
    Liu, P.
    Pala, M. G.
    Baltazar, S.
    Desplanque, L.
    Wallart, X.
    Bayot, V.
    Huant, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047914.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.23.Ad
    03.65.Yz
    85.35.Ds
    Opis:
    This paper presents an overview of scanning-gate microscopy applied to the imaging of electron transport through buried semiconductor nanostructures. After a brief description of the technique and of its possible artifacts, we give a summary of some of its most instructive achievements found in the literature and we present an updated review of our own research. It focuses on the imaging of GaInAs-based quantum rings both in the low magnetic field Aharonov-Bohm regime and in the high-field quantum Hall regime. In all of the given examples, we emphasize how a local-probe approach is able to shed new, or complementary, light on transport phenomena which are usually studied by means of macroscopic conductance measurements.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 569-575
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Epitaxial Fe/(Ga,Mn)As Hybrids
    Autorzy:
    Kalbarczyk, K.
    Dziatkowski, K.
    Szczytko, J.
    Gosk, J.
    Tokarczyk, M.
    Kowalski, G.
    Twardowski, A.
    Bednarski, W.
    Ostrowski, A.
    Waplak, S.
    Martinek, J.
    Liu, X.
    Furdyna, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399140.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.-c
    75.30.Gw
    75.50.Pp
    75.50.Bb
    Opis:
    Thin-film structures composed of two kinds of ferromagnetic material - metallic Fe and semiconducting (Ga,Mn)As - were investigated by means of SQUID magnetometry and ferromagnetic resonance spectroscopy. Dependence of remnant magnetic moment on temperature showed unexpected anisotropic features when recorded along two orthogonal in-plane directions. For one of these orientations, the change in sign of the slope of m(T) curve at the Curie point of (Ga,Mn)As was observed, while for the other, an analogous m(T) curve retained monotonic character. Based on the comparison with ferromagnetic resonance data, the apparent non-monotonicity was attributed to the temperature-induced change of balance between the external magnetic field and uniaxial magnetic anisotropy in the plane of Fe layer.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 873-876
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The INSIDE Project: Innovative Solutions for In-Beam Dosimetry in Hadrontherapy
    Autorzy:
    Marafini, M.
    Attili, A.
    Battistoni, G.
    Belcari, N.
    Bisogni, M.
    Camarlinghi, N.
    Cappucci, F.
    Cecchetti, M.
    Cerello, P.
    Ciciriello, F.
    Cirrone, G.
    Coli, S.
    Corsi, F.
    Cuttone, G.
    De Lucia, E.
    Ferretti, S.
    Faccini, R.
    Fiorina, E.
    Frallicciardi, P.
    Giraudo, G.
    Kostara, E.
    Kraan, A.
    Licciulli, F.
    Liu, B.
    Marino, N.
    Marzocca, C.
    Matarrese, G.
    Morone, C.
    Morrocchi, M.
    Muraro, S.
    Patera, V.
    Pennazio, F.
    Peroni, C.
    Piersanti, L.
    Piliero, M.
    Pirrone, G.
    Rivetti, A.
    Romano, F.
    Rosso, V.
    Sala, P.
    Sarti, A.
    Sciubba, A.
    Sportelli, G.
    Voena, C.
    Wheadon, R.
    Del Guerra, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402609.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.53.Bn
    87.53.Jw
    87.53.Kn
    87.55.N-
    87.55.ne
    87.57.uq
    Opis:
    The INSIDE project addresses the online dose monitoring in particle therapy issue. The proposed detectors exploit the secondary neutral and charged particles emitted during the treatment by the irradiated volumes. The new detection techniques allow to return and online a measurement of the released dose and the Bragg peak position.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1465-1467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Monitoring Performances with the INSIDE System
    Autorzy:
    Pennazio, F.
    Attili, A.
    Battistoni, G.
    Belcari, N.
    Bisogni, M.
    Camarlinghi, N.
    Cappucci, F.
    Cecchetti, M.
    Cerello, P.
    Ciciriello, F.
    Cirrone, G.
    Coli, S.
    Corsi, F.
    Cuttone, G.
    De Lucia, E.
    Ferretti, S.
    Faccini, R.
    Fiorina, E.
    Frallicciardi, P.
    Giraudo, G.
    Kostara, E.
    Kraan, A.
    Licciulli, F.
    Liu, B.
    Marafini, M.
    Marino, N.
    Marzocca, C.
    Matarrese, G.
    Morone, C.
    Morrocchi, M.
    Muraro, S.
    Patera, V.
    Peroni, C.
    Piersanti, L.
    Piliero, M.
    Pirrone, G.
    Rivetti, A.
    Romano, F.
    Rosso, V.
    Sala, P.
    Sarti, A.
    Sciubba, A.
    Sportelli, G.
    Voena, C.
    Wheadon, R.
    Del Guerra, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402611.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.53.Bn
    87.53.Jw
    87.53.Kn
    87.55.N-
    87.55.ne
    87.57.uq
    Opis:
    The INSIDE collaboration aims to build an on-line hadrontherapy monitoring system, based on a dual-head in-beam PET scanner and a secondary charged particles profiler. In this work preliminary experimental results are presented. The validation of the FLUKA-based Monte Carlo simulation tool is shown together with the expected scanner performances.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1468-1470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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