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Wyszukujesz frazę "Hernando, A." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Density of States and Indirect Exchange in Metallic Systems
    Autorzy:
    Hernando, A.
    Rojo, J. M.
    Gómez Sal, J. C.
    Barandiarán, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952835.pdf
    Data publikacji:
    1996-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.30.Et
    75.50.Bb
    Opis:
    The relation between the density of states at the Fermi level and the sign of the indirect coupling in metallic systems is revisited in the framework of a simple model recently outlined by the authors. It is shown that high density of states tends to favor ferromagnetic structures. Some examples which support this idea are indicated. Finally we develop a phenomenological explanation for the antiferromagnetic → ferromagnetic transition induced by heating equiatomic FeRh. The transition is analysed in terms of the increase in the density of states produced by the giant volume expansion associated with the ferromagnetic phase.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 6; 1227-1234
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Permanent Magnetism in Thiol Capped Nanoparticles Gold and ZnO
    Autorzy:
    Crespo, P.
    García, M.
    Fernández-Pinel, E.
    de la Venta, J.
    Merino, J.
    Quesada, A.
    Hernando, A.
    Fernández, A.
    Penadés, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813862.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.+a
    73.22.-f
    75.30.Hx
    Opis:
    In spite of the diamagnetic behavior exhibited by bulk ZnO and Au, a ferromagnetic-like behavior is induced in nanoparticles of both systems by appropriate surface functionalization. By capping with thiol derivatized molecules, magnetic hysteresis is observed even at room temperature, whereas the magnetization has a very little temperature dependence. Capping induces an alteration of their electronic configuration that depends on the capping molecule, as evidenced by X-ray absorption spectroscopy, that strongly affects their magnetic properties.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 515-520
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Study of Magnetization Process in Amorphous FeNiSiB Microwires
    Autorzy:
    Gamcova, J.
    Varga, R.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534004.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.60.Jk
    Opis:
    We have studied the magnetization process in amorphous $Fe_{49.6}Ni_{27.9}Si_{7.5}B_{15}$ microwire. It was found that the hysteresis mechanism consists of two contributions: magnetoelastic and structural relaxation. It was shown that at low frequencies, the magnetization process is controlled mainly by the structural relaxation. At higher frequencies (above 50 Hz), the relaxation effect disappears and switching field is determined mainly by the magnetoelastic contribution. Moreover, the effect of thermal treatment at temperature 300°C has been studied. As-cast microwire is almost unsensible to the applied tensile stress since the applied stresses are lower than that induced during production. After annealing, the stresses relax and stress sensibility of microwires increases.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 807-808
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sexual dimorphism of flathead mullet (Mugil cephalus) from Northern Mindanao rivers using geometric morphometric analysis
    Autorzy:
    Silos, R.-A.
    Hernando, B.J.
    Juario, J.
    Patino, S.
    Casas, P.A.
    D'Zeim Arreza, J.
    Responte, A.
    Vedra, S.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11206.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Sexual dimorphism is biologically important for determining the morphological traits of marine species. Flathead mullet (Mugil cephalus) was examined based on the patterns of sexual dimorphism from the two rivers in Northern Mindanao. The samples were collected from Cagayan de Oro River and Mandulog River to investigate phenotypic divergence and sexual dimorphism in two different populations of wild-caught M. cephalus using geometric morphology based on landmark basis. A total of 17 landmarks were identified to describe the left and right body shapes of the specimen using the TpsRelw (version 1) to obtain the warp scores of each population. Results of the Relative Warp Analysis show no significant variation in the body shape within the sexes in the respective sampling sites. Results of the discriminant function analysis (DFA) show that in Cagayan de Oro River there is no significant variation in the body shape of mullets between sexes suggesting no sexual dimorphism in the flathead mullets in Cagayan de Oro River. In contrast , Discriminant Function Analysis show that there is significant variation in body shape between sexes in Mandulog River in Iligan City suggesting presence of sexual dimorphism in the area which can be due to the presence of abundant and highly diverse predator species in Mandulog River. Sexual dimorphosm can be used by fishes as an adaptive mechanism to maximize predator-escape performance and survival capacity. Furthermore, there is a significant shape variation between populations of mullets in Cagayan de Oro and Mandulog River which can be interpreted as due to geographic isolation which serves as physical barrier on the gene pool. In conclusion, many factors could account for variation in body shape of Mugil cephalus including predation and biogeographical barriers.
    Źródło:
    International Letters of Natural Sciences; 2015, 45
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires
    Autorzy:
    Prida, V.M.
    Salaheldeen, M.
    Pfitzer, G.
    Hidalgo, A.
    Vega, V.
    González, S.
    Teixeira, J.
    Fernández, A.
    Hernando, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032144.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.70.Kw
    75.75.-c
    75.70.-i
    75.70.Rf
    Opis:
    The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 822-827
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ni_2FeSi Heusler Glass Coated Microwires
    Autorzy:
    Galdun, L.
    Ryba, T.
    Prida, V.
    Hernando, B.
    Zhukova, V.
    Zhukov, A.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032750.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    72.20.Lp
    Opis:
    We report on fabrication, structural and magnetic properties of novel Heusler-type glass coated Ni₂FeSi microwires that were prepared by the Taylor-Ulitovsky method, having a metallic nucleus diameter about 3.9 μm and total sample diameter of 39 μm. This single step and low cost fabrication technique offers to prepare up to km of glass-coated microwires starting from few g of cheap elements for diverse applications. The X-ray diffraction data from the metallic nucleus indicates L2₁ crystalline structure (a=5.563 Å), with a possible DO3 disorder. Magnetic measurements determined the Curie temperature well above the room temperature (770 K) together with uniform easy magnetization axis of the metallic core, which predisposes this material to a suitable candidate for spintronic applications.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 851-853
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Susceptibility Spectroscopy in FeNiSiB Microwires
    Autorzy:
    Olivera, J.
    Gamcova, J.
    Varga, R.
    Santos, J.
    Prida, V.
    Sanchez, M.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813592.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Jk
    Opis:
    Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated $Fe_{77.5-x}Ni_xSi_{7.5}B_{15}$ (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 155-158
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Giant Magnetoimpedance in Amorphous and Nanocrystalline Microwires
    Autorzy:
    Talaat, A.
    Zhukova, V.
    Ipatov, M.
    Blanco, J.
    Churyukanova, M.
    Kaloshkin, S.
    Kostitcyna, E.
    Shuvaeva, E.
    Gonzalez-Legarreta, L.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1200823.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.30.Gw
    75.50.-y
    Opis:
    We studied magnetic properties and GMI effect of Finemet-type FeCuNbSiB microwires. We observed that GMI effect and magnetic softness of microwires produced by the Taylor-Ulitovski technique, can be tailored by either controlling magnetoelastic anisotropy of as-prepared FeCuNbSiB microwires or controlling their structure by heat treatment or changing the fabrication conditions. GMI effect has been observed in as-prepared Fe-rich microwires with nanocrystalline structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 146-147
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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