Autor: Kozlowski, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation of the Morphological Structure of Thin Cobalt Films by AFM and TEM
Autorzy:: Szmaja, W.
Balcerski, J.
Kozłowski, W.
Grobelny, J.
Cichomski, M.
Powiązania:: https://bibliotekanauki.pl/articles/1813598.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.55.Jk
68.37.Ps
68.37.Lp
Opis:: Thin obalt films, 40 nm and 100 nm in thickness, were evaporated at an incidence angle of 45° in a vacuum of about $10^{-5}$ mbar, simultaneously on unheated glass substrates and NaCl crystals. The magnetic microstructure of these films was investigated in a previous paper. In the present paper, to obtain an insight into relation between the magnetic microstructure and the morphological structure, we studied the latter structure with atomic force microscopy and transmission electron microscopy. For the films 40 nm as well as 100 nm thick, the presence of contribution of the shape anisotropy (related to the geometric alignment of the grains of the film) to the magnetic anisotropy of the film was found. Nevertheless, for the films investigated, we could not detect crystallographic texture.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 171-174
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Modeling of the Experimental Molecular-Based Ring-Shaped Nanomagnets
Autorzy:: Antkowiak, M.
Kozłowski, P.
Musiał, G.
Florek, W.
Kamieniarz, G.
Esposito, F.
Powiązania:: https://bibliotekanauki.pl/articles/1534905.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.Cx
75.40.Mg
Opis:: Quantum transfer matrix technique and numerically exact diagonalization method are applied to the Heisenberg spin systems to model ring-shaped molecules. Two cases are investigated: (i) a dozen of S = 1 spins with additional biquadratic exchange and (ii) a dimetallic molecule $Cr_7Cd$, where it is assumed that exchange anisotropy is determined in a local coordination system. In the latter case the calculated susceptibility is compared with experimental results.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 965-966
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Studies of the Magnetic Axis Switching in Magnetite
Autorzy:: Król, G.
Kusz, J.
Tarnawski, Z.
Kąkol, Z.
Tabiś, W.
Kozłowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2046773.pdf
Data publikacji:: 2006-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.30.+h
61.50.Ks
75.30.Gw
Opis:: The influence of the external magnetic field on magnetic and crystallographic structure of magnetite was studied. We have confirmed, by means of vibrating sample magnetometer measurements, that external magnetic field can switch the easy magnetic axis to the new crystallographic direction. We have also proved by the direct observation of the crystalline structure that this phenomenon is strictly related to the crystallographic structure relaxation.
Źródło:: Acta Physica Polonica A; 2006, 109, 4-5; 601-605
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Electronic Band Structure and Photoemission States of $Bi_{1.96}Mg_{0.04}Se_3$
Autorzy:: Tokarz, W.
Zalecki, R.
Kowalik, M.
Kołodziejczyk, A.
Kozłowski, A.
Miotkowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1374118.pdf
Data publikacji:: 2014-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.20.-b
71.55.Ak
72.80.Ga
75.47.Lx
79.60.-i
Opis:: We present theoretical band structure calculations and ultraviolet electron photoemission spectroscopy of a topological insulator $Bi_{1.96}Mg_{0.04}Se_3$. Our calculations were based on the first-principles density functional theory with general gradient approximation using Wien2k package with the spin-orbit interaction included by a second-variation method. The R3̅m crystal structure was optimized. In consequence, 4% decrease of volume and 3% decrease of ratio c/a was obtained. This modified structure was multiplied three times in a and b direction in order to place proper amount of Mg. Final crystal structure P3m1 with 135 atoms was used for the calculations. As a result metallic band structure was obtained with conduction band extended from -5.6 eV up to 0.16 eV. It composes mostly from Se p states. Comparison of total DOS with ultraviolet photoemission spectrum shows similar features.
Źródło:: Acta Physica Polonica A; 2014, 126, 4a; A-127-A-129
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Electronic Properties of High-Temperature Superconductor DyBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ from Critical Fields and Specific Heat Studies
Autorzy:: Kołodziejczyk, A.
Kozłowski, A.
Chmist, J.
Zalecki, R.
Ściężor, T.
Tarnawski, Z.
Woch, W. M.
Powiązania:: https://bibliotekanauki.pl/articles/1929388.pdf
Data publikacji:: 1993-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.70.-b
76.30.-v
Opis:: The lower and upper critical fields, as well as the specific heat were measured as a function of temperature for good quality DyBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ high-temperature superconductor in the vicinity of superconducting transition temperature T$\text{}_{c}$ = 91.2 K. The number of superconducting and normal state electronic quantities were determined basing on the Ginzburg-Landau-Abrikosov-Gorkov theory. It is argued that on the basis of this BCS-like theory one can describe the superconducting properties and, in combination with some information on the electronic structure, also the magnetic properties of high-temperature superconductors.
Źródło:: Acta Physica Polonica A; 1993, 84, 1; 127-138
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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