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    Wyświetlanie 1-9 z 9
    Tytuł:
    XAFS Studies of the Behaviour of Bi in Co/Cu Multilayers
    Autorzy:
    Krupiński, M.
    Kąc, M.
    Polit, A.
    Zabila, Y.
    Zając, D.
    Marszałek, M.
    Kapusta, Cz.
    Dobrowolska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809826.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cj
    68.55.-a
    68.65.Ac
    Opis:
    The atomic environment of Bi atoms in the Co/Cu multilayered system was studied with X-ray absorption fine structure spectroscopy. Experiments were carried out on a Co(1 nm)/Cu(2 nm) system with 5 and 10 repetitions of Co/Cu evaporated with very low deposition rate in ultrahigh vacuum. A very small amount of Bi (0.06 nm) was deposited on each Cu film in the system. The X-ray absorption fine structure spectra were measured at the $BiL_3$ edge in the X-ray absorption near-edge structure and extended X-ray absorption fine structure ranges at the Beamline X1 of HASYLAB/DESY synchrotron laboratory in Hamburg. The experimental data showed different local neighbourhood of Bi, depending on the number of Co/Cu bilayer repetitions. The results are discussed in terms of the location and segregation of the Bi atoms as well as its possible oxidation ways.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 565-567
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An NMR study of Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$Mn$\text{}_{1-x}$Ga$\text{}_{x}$O$\text{}_{3}$ (x=0 and 0.03)
    Autorzy:
    Oates, C. J.
    Kapusta, Cz.
    Riedi, P. C.
    Sikora, M.
    Zając, D.
    Rybicki, D.
    Martin, C.
    Yaicle, C.
    Maignan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037129.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.-k
    75.47.Gk
    Opis:
    An NMR study of polycrystalline Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$Mn$\text{}_{1-x}$Ga$\text{}_{x}$O$\text{}_{3}$ (x=0 and 0.03) at 3 K is presented. Zero field spin-echo spectra of the Ga doped compound consist of an overlapping $\text{}^{69,71}$Ga signal at 74~MHz (hyperfine field of 5.3 T), a $\text{}^{55}$Mn double exchange line at 375 MHz (35.5 T) and a weak Mn$\text{}^{3+}$ signal between 400 and 550 MHz. Measurements in an applied field show a step-like increase in the double exchange line intensity, which corresponds to an increase in the amount of the ferromagnetic metallic phase. This coincides with a step-like feature in the bulk magnetization measurements. The effect is similar to that in the previous field dependent $\text{}^{55}$Mn NMR measurements of Pr$\text{}_{0.67}$Ca $\text{}_{0.33}$MnO$\text{}_{3}$. At the demagnetized and remanent state, a variation of spin- spin relaxation time, T$\text{}_{2}$, across the $\text{}^{55}$Mn line, due to the Suhl-Nakamura interaction is observed, which suggests that the ferromagnetic metallic double exchange regions, at liquid helium temperatures, are at least 4 nm in size.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 189-195
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A $\text{}^{55}$Mn NMR Study of La$\text{}_{0.33}$Nd$\text{}_{0.33}$Ca$\text{}_{0.34}$Mn O$\text{}_{3}$ with $\text{}^{16}$O and $\text{}^{18}$O
    Autorzy:
    Rybicki, D.
    Kapusta, Cz.
    Riedi, P. C.
    Oates, C. J.
    Sikora, M.
    Zając, D.
    De Teresa, J. M.
    Marquina, C.
    Ibarra, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037128.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.-k
    75.47.Gk
    Opis:
    A $\text{}^{55}$Mn NMR study of $\text{}^{16}$O and $\text{}^{18}$O containing La$\text{}_{0.33}$Nd$\text{}_{0.33}$Ca$\text{}_{0.34}$Mn O$\text{}_{3}$ is reported. The spin-echo spectra measured at 4.2 K and zero field consist of a double exchange line corresponding to the ferromagnetic metallic regions. The line intensity is more than an order of magnitude lower for the $\text{}^{18}$O compound, which indicates an order of magnitude lower content of the ferromagnetic metallic phase in this compound. The frequency dependence of the spin-spin relaxation time T$\text{}_{2}$ shows a pronounced minimum at the center of the double exchange line of both compounds due to the Suhl-Nakamura interaction, which indicates that the ferromagnetic metallic regions are at least 10~nm in size. The results are discussed in terms of the influence of oxygen isotopic substitution on phase segregation.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 183-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NMR Study of (Sr,Ba,La)$\text{}_{2}$Fe$\text{}_{1+y}$Mo$\text{}_{1-y}$O$\text{}_{6}$ Double Perovskites
    Autorzy:
    Zając, D.
    Kapusta, Cz.
    Riedi, P. C.
    Sikora, M.
    Oates, C. J.
    Rybicki, D.
    De Teresa, J. M.
    Serrate, D.
    Marquina, C.
    Ibarra, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041522.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    76.60.-k
    78.70.Gq
    75.47.Gk
    Opis:
    The $\text{}^{95}$Mo and $\text{}^{97}$Mo NMR spin-echo study of (Sr,Ba,La)$\text{}_{2}$Fe$\text{}_{1 +y}$Mo$\text{}_{1-y}$O$\text{}_{6}$ double perovskites is reported. Powder samples of Ba$\text{}_{1.44}$Sr$\text{}_{0.36}$La$\text{}_{0.2}$FeMoO$\text{}_{6}$ and (Ba$\text{}_{0.8}$Sr$\text{}_{0.2}$)$\text{}_{2-2x}$La$\text{}_{x}$#$\text{}_{x}$ Fe$\text{}_{1+y}$Mo$\text{}_{1-y}$O$\text{}_{6}$, where# denotes vacancies, for: x=0, y=0; x=0.1, x=0.2 and x=0.3, y=0 and y=0.2 were measured at 4.2 K and no applied magnetic field. NMR signals are observed at 55-100 MHz for the main line and 30-55 MHz for low-frequency satellite. The main line and the satellite are attributed to the ideal and defect positions of Mo atoms. La and vacancy doping introduce more defects, however, increasing the Fe/Mo ratio decreases the amount of defect Mo sites. La doping causes a satellite pattern at the high frequency side of the spectrum, which is related to different numbers of the La next neighbours. The effect is attributed to an increase in the electron density and the corresponding magnetic moment at the adjacent Mo sites and reveals a local character of the electron doping.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 759-765
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Magnetic and Electronic Properties of the A$\text{}_{2}$FeM'O$\text{}_{6}$ (A = Ba, Sr, Ca, M' = Mo, Re) Double Perovskites
    Autorzy:
    Zając, D.
    Sikora, M.
    Prochazka, V.
    Borowiec, M.
    Stępień, J.
    Kapusta, Cz.
    Riedi, P. C.
    Marquina, C.
    De Teresa, J. M.
    Ibarra, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047344.pdf
    Data publikacji:
    2007-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    76.60.-k
    76.60.Jx
    78.80.En
    Opis:
    The results of a combined NMR, X-ray absorption spectroscopy and X-ray magnetic cirrcular dichroism study of the AA'FeMoO$\text{}_{6}$ and AA'FeReO$\text{}_{6}$ double perovskites are presented. They revealed a dependence of electronic and magnetic properties, including a d-electron transfer between Fe and Mo sites, on the structural tolerance factor. The maximum value of the 4d Mo electron occupation and the corresponding Mo moment is obtained for the tolerance factor of unity. This corresponds to the maximum strength of the magnetic interaction and, respectively, to the Curie temperature. The dominant T$\text{}^{5}\text{}^{/}\text{}^{2}$ type temperature dependence of the Mo hyperfine field reveals the half-metallicity of the AA'FeMoO$\text{}_{6}$ compounds. Antisite defects and antiphase boundaries have been identified in NMR measurements and the strength of their magnetic coupling have been determined. A considerable orbital contribution to the Re and Fe magnetic moments were found in the NMR and X-MCD measurements on the AA'FeReO$\text{}_{6}$ compounds. Its magnitude decreases with increasing structural tolerance factor and is correlated with their magnetic anisotropy.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 6; 797-820
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perception of the Laser Radiation for the Near Infrared Range
    Autorzy:
    Kecik, D.
    Kasprzak, J.
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493248.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.66.-p
    42.66.Ct
    42.66.Ne
    Opis:
    During the diagnostic research done by means of optical devices equipped with radiation sources from the near infrared range the phenomena indicating the perception possibility of this range by a human eye were observed. In this contribution the initial results of the research of this phenomenon were presented. Sources of radiation applied in laser polarimeters (785 nm) and devices designed for optical coherent tomography (820, 850 nm) were taken into particular consideration. Perception tests with the use of a laser diode generating at the wavelength of 940 nm were also carried out. It was stated that the radiation from the range examined can be recorded by a human eye giving a colour sensation - in practice independently of the wavelength of the radiation beam falling into a retina.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 686-687
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement Possibility Analysis of the Real Values of the Tissue Structure Parameters with the Use of Optical Coherent Tomography Method
    Autorzy:
    Kasprzak, J.
    Kęcik, D.
    Zajac, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493240.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.-f
    42.79.-e
    42.79.Ls
    42.30.Wb
    87.19.rm
    Opis:
    The issues connected with the usefulness of the method of averaging A-scans applied in measurements of real optical parameters with the use of commercial optical coherent tomography systems have been discussed. The basic method description and examples of applications have been given. Examples of the characteristics of metrological devices used in medical practice as well as the possibility of the method applied to the turbidity assessment have been presented.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 662-665
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of Information Extraction from OCT Images
    Autorzy:
    Zajac, A.
    Urbański, Ł.
    Kasprzak, J.
    Kecik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493300.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.-s
    42.79.Qx
    42.30.Wb
    Opis:
    Optical diagnostic methods of biological media are more and more willingly used in clinical practice - also instead of classical biopsy. Particularly, optical coherent tomography methods and mammography (permitting achieving three-dimensional imaging of a tissue) are attractive in comparison with classical diagnostic methods. The article presents the analysis methods of optical parameters of biological tissues developed allowing obtaining absolute values of these parameters. Thanks to modern image analysis methods - wavelet transforms - the optical diagnostic effectiveness was improved. The theoretical and practical results achieved were compared with results of commercially accessible methods implemented in OCT devices.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 772-775
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $Fe_3O_4$ Films on Fe(001)
    Autorzy:
    Zając, M.
    Aernout, D.
    Freindl, K.
    Matlak, K.
    Spiridis, N.
    Ślęzak, M.
    Ślęzak, T.
    Korecki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814041.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.+a
    76.80.+y
    Opis:
    We investigated the magnetic properties of ultrathin magnetite films deposited directly on MgO(001) and on a Fe(001) buffer layer. In both cases the magnetite surface structure could be identified using low energy electron diffraction. The conversion electron MÖssbauer spectroscopy measurements proved that, for magnetite films deposited on the Fe buffer, superparamagnetic relaxation was strongly suppressed. The effect of a Fe overlayer on the magnetite film grown directly on MgO is considerably weaker. Longitudinal Kerr magnetometry indicated the presence of the ferromagnetic interfacial coupling between Fe and magnetite films. We conclude that the density of antiphase boundaries for films grown on the Fe buffer is lower than that of $Fe_3O_4$/MgO films.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1318-1325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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