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dc.contributor.authorPenteado, P. H.-
dc.contributor.authorSouza, F. M.-
dc.contributor.authorSeridonio, A. C.-
dc.contributor.authorVernek, E.-
dc.contributor.authorEgues, J. C.-
dc.identifier.citationPhysical Review B. College Pk: Amer Physical Soc, v. 84, n. 12, p. 10, 2011.-
dc.description.abstractWe theoretically investigate spin-polarized transport in a system composed of a ferromagnetic scanning-tunneling-microscope (STM) tip coupled to an adsorbed atom (adatom) on a host surface. Electrons can tunnel directly from the tip to the surface or via the adatom. Since the tip is ferromagnetic and the host surface (metal or semiconductor) is nonmagnetic we obtain a spin-diode effect when the adatom is in the regime of single occupancy. This effect leads to an unpolarized current for direct bias (V > 0) and polarized current for reverse (V < 0) bias voltages, if the tip is nearby the adatom. Within the nonequilibrium Keldysh technique we analyze the interplay between the lateral displacement of the tip and the intra adatom Coulomb interaction on the spin-diode effect. As the tip moves away from the adatom the spin-diode effect vanishes and the currents become polarized for both V > 0 and V < 0. We also find an imbalance between the up and down spin populations in the adatom, which can be tuned by the tip position and the bias. Finally, due to the presence of the adsorbate on the surface, we observe spin-resolved Friedel oscillations in the current, which reflects the oscillations in the calculated local density of states (LDOS) of the subsystem surface + adatom.en
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)-
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.publisherAmer Physical Soc-
dc.sourceWeb of Science-
dc.titleScanning tunneling microscope operating as a spin diodeen
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Federal de Uberlândia (UFU)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil-
dc.description.affiliationUniv Fed Uberlandia, Inst Fis, BR-38400902 Uberlandia, MG, Brazil-
dc.description.affiliationUniv Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPhysical Review B-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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