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    Wyświetlanie 1-4 z 4
    Tytuł:
    Coercivity of Ultrathin Magnetic Films with Perpendicular Anisotropy
    Autorzy:
    Zablotskii, V.
    Kisielewski, M.
    Tsiganenko, O.
    Ferre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013072.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.-d
    75.60.Ch
    75.70.Ak
    Opis:
    The calculation of the temperature dependence of the domain wall coercivity of ultrathin magnetic films with perpendicular anisotropy is reported. In this case, the magnetization reversal is supposed to occur through domain wall motion. The proposed model takes into account thermal bending fluctuations of the domain wall, which is pinned by crystal defects such as grain boundaries. A fitting procedure, applied to recently published experimental data on the field induced domain wall velocity in Au/Co films, allows us to find out realistic values of the involved parameters.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 471-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Magnetic Properties of Pt/Co/Pt Films by $Ga^{+}$ Ion Irradiation: Focused versus Uniform Irradiation
    Autorzy:
    Sveklo, I.
    Mazalski, P.
    Jaworowicz, J.
    Jamet, J.
    Vernier, N.
    Mougin, A.
    Ferré, J.
    Kisielewski, M.
    Zablotskii, V.
    Bourhis, E.
    Gierak, J.
    Postava, K.
    Fassbender, J.
    Kanak, J.
    Maziewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398198.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    ultrathin films
    ion irradiation
    magnetic hysteresis
    magnetic anisotropy
    magneto-optic Kerr effect
    Opis:
    30 keV $Ga^{+}$ irradiation-induced changes of magnetic and magneto-optical properties of sputtered Pt/Co/Pt ultrathin trilayers films have been studied as a function of the ion fluence. Out-of-plane magnetic anisotropy states with enhanced magneto-optical effects were evidenced for specific values of cobalt thickness and irradiation fluence. Results obtained after uniform or quasi-uniform focused ion beam irradiation on either out-of-plane or in-plane magnetized sputtered pristine trilayers are compared. Similar irradiation-induced magnetic changes are evidenced in quasi-uniformly focused ion beam or uniformly irradiated films, grown either by sputtering or molecular beam epitaxy. We discuss on plausible common mechanisms underlying the observed effects.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1215-1226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Properties and Complexity of Al-Based Complex Metallic Alloys
    Autorzy:
    Dubois, J.
    Belin-Ferré, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202961.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.82.Bg
    61.44.Br
    71.55.Ak
    71.23.Ft
    72.15.-v
    Opis:
    As a consequence of their structural complexity, the electron transport properties of Al-based complex metallic alloys scale as simple power laws of the number of atoms in the primitive unit cell. Furthermore, presence in energy space of localised, d-like states below the Fermi level is systematically observed, even in the absence of any transition metal constituting element. The relative intensity of this contribution to the total density of states correlates with the structural complexity of the compound. Thus, complexity plays a key role, via Hume-Rothery, hybridization effects and most probably hopping, in the selection, formation and stability of Al-based complex metallic alloys. The results are interpreted in terms of self-organized criticality. In order to promote discussion about the essence of the quasicrystalline state ("why are the atoms where they are?"), a speculative model is suggested.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 453-457
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intellectual and cognitive structures of the agricultural competitiveness research under climate change and structural transformation
    Autorzy:
    García-Agüero, Ana-Isabel
    Teran-Yepez, Eduardo
    Batlles-delaFuente, Ana
    Belmonte-Ureña, Luis J.
    Camacho-Ferre, Francisco
    Powiązania:
    https://bibliotekanauki.pl/articles/39829629.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    agriculture
    competitiveness
    bibliographic coupling
    co-word analysis
    thematic structure
    current research trends
    sustainable agriculture
    Opis:
    Research background: Although agricultural competitiveness is not a new topic, it is worth noting that it has recently come back to the attention of researchers due to various factors such as climate change, food security, price uncertainty, or structural transformation. Consequently, a growing number of articles have emerged on this subject, leading to shifts in overarching research trends and the structure of research within this domain. Purpose of the article: This study aims to facilitate a comprehensive understanding of the research constituents within the field of agricultural competitiveness. Additionally, it seeks to unveil the intellectual and cognitive frameworks spanning the years 1990 to 2022. This exploration will enable the identification of thematic clusters that both shape and guide the field, shedding light on current research trends. Methods: This research employs bibliometric analysis, specifically employing performance analysis and science mapping techniques like bibliographic coupling and co-word analyses. These tools are harnessed to scrutinize the constituents of research and the underlying intellectual and cognitive structures inherent to the agricultural competitiveness field. A dataset of 622 articles from the Web of Science database was subjected to analysis using the VOSviewer software. Findings & value added: The findings prominently illustrate a notable surge in research activity within this domain, with a substantial proportion of articles originating from the United States. The study further identifies six distinct research topics within agricultural competitiveness: (1) energy efficiency and bioenergy, (2) price fluctuation, uncertainty, and market behavior, (3) structural transformation of agriculture, (4) rural development, (5) policy issues, and (6) climate change. Moreover, the research offers insights into potential future research avenues. The uniqueness and value of this work stem from its pioneering approach, being the first to synthesize agricultural competitiveness research through an amalgamation of bibliometric techniques. Furthermore, the study contributes substantially to the theoretical advancement of agricultural competitiveness research.
    Źródło:
    Oeconomia Copernicana; 2023, 14, 4; 1175-1209
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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