Giant Magnetoresistance
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Comparison of computed amplitudes of magnetoresistance in spin-valve structures with wafer probe measurements
A code has been developed based on the semi-classical theory of giant magnetoresistance of Camley and Barnas [l]. It computes the sheet conductance and magnetoresistance of spin-valve structures. The input parameters are phenomenological transport parameters (mean-free paths and reflection/transmission coefficients at interfaces). These parameters are fairly
Publicado em: 2011
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2. Giant superconducting proximity effect in graphite / Efeito de proximidade gigante entre supercondutor e grafite
In order to verify the existence of superconducting correlations in graphite, in this work we studied the possibility of the so-called giant proximity effect in highly oriented pyrolytic graphite (HOPG) samples. Magnetoresistance measurements performed on various thoroughly characterized HOPG samples with attached superconducting In or Pb-In electrodes revea
Publicado em: 2009
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3. MagnetoresistÃncia em filmes e multicamadas magnÃticas
In this master dissertation, we have studied, at room temperature, magnetic and transport properties of metallic films and multilayer of different structures such as: single layer thin films, coupled trilayer, ferromagnetic/antiferromagnetic bilayer and spin valve. Phenomenological models, which take in account the most relevant magnetic free energy terms, w
Publicado em: 2005
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4. Growth of single crystal fibers by the technique LHPG and characterization of compounds Ba0,77Ca0,23TiO3, Ca2FeMoO6, CaMoO4 and SrMoO4-CaMoO4 (crystal gradient). / Crescimento de fibras monocristalinas pela técnica LHPG e caracterização dos compostos Ba0,77Ca0,23TiO3, Ca2FeMoO6, CaMoO4 e SrMoO4-CaMoO4 (cristal gradiente).
Este trabalho teve como finalidade determinar e otimizar as condições para a preparação e a caracterização de monocristais de alguns óxidos que apresentam considerável dependência de suas propriedades físico-químicas finais e magnitude da pressão da atmosfera de crescimento. Experimentos que envolvem diversas adaptações de um sistema de fusão
Publicado em: 2003
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5. Propriedades magneticas de manganitas, fitas amorfas e filmes finos com anisotropia unidirecional
In this work we will present a study of the magnetic properties of three systems: manganites, amorphous ribbons and bilayers with exchange bias. Whole the magnetization measurements were made in a SQUID magnetometer developed during the period of this thesis. We studied several films and buck manganitas samples. All samples present the effect of the colossal
Publicado em: 2002
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6. Efeitos diamagneticos dependentes do Spin nas propriedades de transporte em multicamadas magneticas
Diamagnetic and spin-dependent Fermi surface effects are included in the calculation of the transport properties of metallic magnetic multilayers, to elucidate whether they can explain the Giant Magnetoresistance (GMR) effect observed in those systems. We consider that electrons in a multilayer sample, are subjected to a strong effective internal magnetic fi
Publicado em: 1999
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7. Estudo por EXAFS de nanoparticulas de cobalto imersas em uma matriz de cobre
Granular solids are a class of materia1s that presents several properties, with significant possibilities in the technological applications. In this work we have performed structural characterization of a granular solid of cobalt in a copper matrix, fabricated by melt-spinning method and thermally treated by Joule heating. In principle, the thermal treatment
Publicado em: 1998