Magnetometry
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. CARACTERIZACÃO DAS PROPRIEDADES ESTRUTURAIS E MAGNÉTICAS DA SÉRIE SmFe1xMnxO3. / CHARACTERIZATION OF THE PROPERTIES STRUCTURAL MAGNETIC AND SERIES SmFe1 xMnxO3.
In this work we synthesized sample of the series SmFe1xMnxO3 , in which 1 x 0 whit variation of x = 0:1. Our main objective was the structural and magnetic characterization of the compounds. First, to the best of our knowledge, these samples were obtained by the combustion reaction method, with which we achieve success in obtaining unique polycrystalline pha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2012
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14. Survey and study of graphite occurrences in the Aracoiába-Baturité graphite bearing District, CE / Levantamento e estudo das ocorrências de grafita do Distrito Grafitífero Aracoiába-Baturité, CE
The Aracoiába-Baturité Graphite-bearing District has graphitic gneiss deposits (disseminated ore) and vein (solid ore) with different genetic origins and their own physical characteristics and geological environments. The graphite gneiss ore is of sedimentary, syngenetic origin, with 1.5% to 8% C content, which is distributed along two long parallel belts,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
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15. Anisotropias magnéticas em filmes finos de Co: Uma análise por magnetometria de torque / Magnetic anisotropies in Co thin films:An analysis by torque magnetometry
By studying the magnetic behavior of materials a very important parameter to be analyzed are the constants of anisotropy. They can be associated with an effective anisotropy energy or to a more specific one as, for example, the magnetocrystalline. During the thin films deposition by magnetron sputtering, an uniaxial effective anisotropy can be induced due to
Publicado em: 2010
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16. Síntese e caracterização de filmes à base de Si e Ge dopados com espécies magnéticas / Synthesis and characterization of Si and Ge based films doped with magnetic species
Along the last few years, the doping of semiconductors (either II-VI, IV-VI, III-V, and group-IV compounds) with magnetic species have been extensively studied due to their potential applications in spintronics. Among them, Si- and Ge-based magnetic semiconductors are very attractive because of their total compatibility with the well-established current semi
Publicado em: 2010
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17. Reavaliação deposicional da Bacia de São José de Itaboraí com base em dados geológicos e geofísicos / Revaluation of the deposicional evolution of the São José de Itaboraí Basin based on geological and geophysical data
A Bacia de São José de Itaboraí está localizada no Município de Itaboraí, no Estado do Rio de Janeiro. Ela foi descoberta em 1928, pelo Engenheiro Carlos Euler, que após analisar um suposto caulim encontrado na Fazenda São José pelo seu então proprietário, Sr. Ernesto Coube, verificou que se tratava de calcário. Os Professores Rui Lima e Silva e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2009
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18. Estudo in-situ de filmes magnéticos ultrafinos por magnetometria Kerr e técnicas de superfície
The aim of this work is to apply Kerr magnetometry to ultra-thin magnetic films. A Kerr magnetometer operating in ultra high vacuum is described, as well as the modications and optimizations we have done, to achieve atomic monolayer sensibility. We present measurements performed on samples with different magnetic properties, such as exchange bias effect, sys
Publicado em: 2009
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19. Interação da matéria de vórtices com estruturas de defeitos : detecção das primeiras penetrações
This thesis results from a systematic study of the interactions between penetrated vortices and pinning centers carried out on structured superconductors films of YBCO, Nb and Pb. A regular array of pinning centers (antidots, ADs) was inserted in those samples by mechanical indentations (in YBCO and Nb films), and by a lithographic processes (Pb). The struct
Publicado em: 2009
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20. Multicamadas magnéticas de telureto de európio e semicondutores iv-vi crescidas por epitaxia de feixe molecular / Magnetic multilayers of europium telluride and IV-VI semiconductors grown by molecular beam epitaxy
In this work, thin EuTe films and EuTe/PbTe(SnTe) superlattices were grown, and their structural and magnetic properties were characterized. The molecular beam epitaxial growth parameters of the samples were optimized, particularly those of the EuTe/SnTe SLs. To this goal, the growth modes of EuTe on SnTe and vice versa were investigated, and the influence o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/10/2008
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21. Co2Z hexaferrite obtained by the citrate precursor method in an inert atmosphere
Nanoparticles of Co2Z hexaferrite were synthesized by the citrate sol-gel process under an inert atmosphere, then thermally analyzed by Thermogravimetric and Differential Thermal Analysis and characterized by X-ray Diffraction, Scanning Electron Microscopy, Atomic Force Microscopy, X-ray Fluorescence and Vibration Sample Magnetometry. Z-type barium hexaferri
Matéria (Rio de Janeiro). Publicado em: 2008-06
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22. Propriedades magnÃticas e Ãpticas de filmes finos rugosos
In this dissertation we study the influence of susbtrate roughness on the magnetic and optical properties of polycrystalline permalloy (Py) films and the optical properties of thin silver (Ag) films, when deposited on this support. The surface roughness of the glass substrates was generated by chemical attack with high concentration flouridic acid vapor (HF-
Publicado em: 2008
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23. InterpretaÃÃo sÃsmica e modelamento magnetomÃtrico e gravimÃtrico 2D e 3D de corpos vulcÃnicos localizadosna sub-bacia do Platà de Pernambuco: uma contribuiÃÃo Ãsua evoluÃÃo tectono-estratigrÃfica
A Sub-bacia do Platà de Pernambuco à uma das Ãltimas porÃÃes sedimentares percebidas e descritas na literatura, e certamente uma das Ãltimas a ser formada durante a separaÃÃo das placas Sul-Americana e Africana. Ela corresponde à sub-bacia offshore da Bacia de Pernambuco e à marcada por grande proporÃÃo de derrames vulcÃnicos ocasionados provave
Publicado em: 2008
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24. Ligas magnéticas NiFe e NiFeCo eletrodepositadas, voltadas para aplicações em micro-sensores magnéticos tipo fluxgate planar / Electrodeposited NiFe and NiFeCo films for planar fluxgate sensors
This work presents the results about the fabrication and characterization of thin films of NiFe and NiFeCo alloys. The attempts to construct the planar fluxgate are also presented. Galvanostatic electrodeposition using an electrolytic solution containing Ni and Fe was used: NiSO4 (0,7 mol/l); NiCl2 (0,02 mol/l); FeSO4 (0,03 mol/l); H3BO3 (0,4 mol/l) and C7H5
Publicado em: 2007