Výsledky vyhledávání - "W. T. Herrera"

Iron nano-clusters in ytterbium films: a 57Fe Mössbauer spectroscopic study

Autor: F. J. Litterst, C. Rojas-Ayala, I. S. Dinóla, E. M. Baggio-Saitovitch, Edson C. Passamani, M. Kraken, W. T. Herrera

Publikováno v: Hyperfine Interactions. 224:299-305

We have performed a Mossbauer study on iron clusters that are formed in ytterbium films prepared by vapor co-deposition onto kapton substrates kept at room temperature. The film thicknesses were chosen in a range between 2.5 and 2.8 µm. XRD of the f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a324a4a674bc7cf4384ae61b5ab12775
https://doi.org/10.1007/s10751-013-0821-x

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Aggregates of iron in ytterbium films

Autor: F. J. Litterst, J. Engelke, C. Rojas-Ayala, Edson C. Passamani, E. M. Baggio-Saitovitch, W. T. Herrera, M. Kraken, I. S. Dinóla

Publikováno v: Hyperfine Interactions. 203:143-147

Films of ytterbium doped with iron (0.3–1.6 at.% Fe) have been prepared by co-deposition of atomic beams of the elements onto Kapton substrates under high vacuum. Iron is immiscible in ytterbium and various iron species are expected to occur. XRD r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::84349d5a79150aea0f553354caed38ab
https://doi.org/10.1007/s10751-011-0357-x

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Synthesis and characterization of iron oxide nanoparticles dispersed in mesoporous aluminum oxide or silicon oxide

Autor: W. T. Herrera, Tiago Pinheiro Braga, Antoninho Valentini, E. Baggio-Saitovitch, Antonio Narcisio Pinheiro, Y. T. Xing

Publikováno v: Journal of Materials Science. 46:766-773

Iron oxide nanoparticles dispersed in aluminum (Al) or silicon (Si) oxides were prepared via a polymeric precursor derived from the Pechini method. The samples were characterized by thermogravimetric analysis, Fourier-transform infrared spectroscopy,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::464c9b1f0da149a7d5036f6a3aa75264
https://doi.org/10.1007/s10853-010-4811-y

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Low temperature magnetic ordering in Fe-doped TiO 2 samples

Autor: W. T. Herrera, C.E. Rodríguez Torres, E. M. Baggio-Saitovich, A.M. Mudarra Navarro, Francisco H. Sánchez, A.F. Cabrera, D. R. Sánchez, V. Bilovol

Publikováno v: Hyperfine Interactions. 195:155-159

Fe-doped TiO2 samples with different Fe content prepared by mechanical alloying have been investigated by means of Mossbauer spectroscopy at 300 and 4.2 K. The results indicate the coexistence of Fe2 + and Fe3 + ions in paramagnetic states at room te

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4dd9f842b631663d72b2bbb82ec5c577
https://doi.org/10.1007/s10751-009-0113-7

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Superconductor-insulator transition tuned by annealing in Bi-film on top of Co-clusters

Autor: I. S. Dinóla, Y. T. Xing, H. Micklitz, M. B. Fontes, E. Baggio-Saitovitch, Mucio A. Continentino, W. T. Herrera

Publikováno v: The European Physical Journal B. 86

We deposited amorphous Bi films with a thickness between 3 and 6.5 nm at 4.2 K on top of previously deposited Co clusters having a mean size of ∼4.5 nm. The Co cluster layers thickness was between 2.3 and 5 nm. In-situ electrical transport measurem

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f5c45a86287011a55201a0e2f153d8f
https://doi.org/10.1140/epjb/e2013-40337-3

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Insulator–superconductor transition in bi-layers of Co clusters and Bi

Autor: Y. T. Xing, H. Micklitz, E. Baggio-Saitovitch, Mucio A. Continentino, W. T. Herrera, I. S. Dinóla

Publikováno v: Journal of Nanoparticle Research. 15

We have performed electrical resistance measurements on films of pure Bi and hybrid films of Co/Bi consisting of Co nanoclusters having a mean size of ∼4.5 nm covered by Bi. Films were produced by deposition of Bi on top of a layer of well-defined

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6d522ffe99bf9fe42b93c30a0f470613
https://doi.org/10.1007/s11051-013-1782-3

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Iron nano-clusters in ytterbium films: a 57Fe Mössbauer spectroscopic study

Autor: C. Rojas-Ayala, W. T. Herrera, I. S. Dinóla, M. Kraken, E. C. Passamani, E. Baggio-Saitovitch, F. J. Litterst

Publikováno v: LACAME 2012 ISBN: 9789400764811

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2b61a0e4321887d0627a07bbb4e4191e
https://doi.org/10.1007/978-94-007-6482-8_35

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Kondo effect and spin-glass behavior of dilute iron clusters in silver films

Autor: F. J. Litterst, Y. T. Xing, S. M. Ramos, M. B. Fontes, P. Munayco, E. Baggio-Saitovitch, W. T. Herrera

Publikováno v: Physical Review B. 84

W. T. Herrera,1,* Y. T. Xing,1 S. M. Ramos,1 P. Munayco,1 M. B. Fontes,1 E. M. Baggio-Saitovitch,1 and F. J. Litterst2 1Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, 22290-180, Rio de Janeiro, Brazil 2Institute for Physics of Con

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c46aabbd126cdeb8adfe87d8e08d3904
https://doi.org/10.1103/physrevb.84.014430

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