Navegando por Autor "Santos, O. Alves"

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    The role of metallic nanoparticles in the enhancement of the spin Hall magnetoresistance in YIG/Pt thin films
    (Journal of Magnetism and Magnetic Materials, 2018-11-15) Mendes, J. B. S; Gamino, M.; Silva, E. F.; Santos, O. Alves; Rodríguez-Suárez, R. L.; Machado, F. L. A.; Azevedo, A.; Rezende, S. M.
    Enhancements in the spin Hall magnetoresistance (SMR) close to one order of magnitude in bilayers of yttrium iron garnet (YIG) and platinum with embedded metallic nanoparticles of Ag and Cu are reported. The en hancement in the electrical detection of the back reflected spin current in YIG/Pt-MP(t MP )-Pt relative to YIG/Pt is eff attributed to the increase in the effective spin Hall angle ( θ^eff SHA) due to the presence of the metallic nanoparticles. The maximum value observed for the spin Hall magnetoresistance is related to critical thickness of the t MP close to the percolation threshold. The results are also supported by data obtained by means of the spin pumping effect where dc-voltage measurements confirm the enhancement of the spin to charge conversion process.
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    Spin-current to charge-current conversion and magnetoresistance in a hybrid structure of graphene and yttrium iron garnet
    (Physical Review Letters, 2015-11-25) Mendes, J. B. S.; Santos, O. Alves; Meireles, L. M.; Lacerda, R. G.; Vilela-Leão, L. H.; Machado, F. L. A.; Rodríguez-Suárez, R. L.; Azevedo, A.; Rezende, S. M.
    The use of graphene in spintronic devices depends, among other things, on its ability to convert a spin excitation into an electric charge signal, a phenomenon that requires a spin-orbit coupling (SOC). Here we report the observation of two effects that show the existence of SOC in large-area CVD grown single-layer graphene deposited on a single crystal film of the ferrimagnetic insulator yttrium iron garnet (YIG). The first is a magnetoresistance of graphene induced by the magnetic proximity effect with YIG. The second is the detection of a dc voltage along the graphene layer resulting from the conversion of the spin current generated by spin pumping from microwave driven ferromagnetic resonance into a charge current, which is attributed to the inverse Rashba-Edelstein effect.