Superconductors as spin sources for spintronics (Articolo in rivista)

Type
Label
  • Superconductors as spin sources for spintronics (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Giazotto, F; Taddei, F (2008)
    Superconductors as spin sources for spintronics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giazotto, F; Taddei, F (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 77 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Giazotto, F.; Taddei, F.] Scuola Normale Super Pisa, I-56126 Pisa, Italy; [Giazotto, F.; Taddei, F.] NEST CNR INFM, I-56126 Pisa, Italy (literal)
Titolo
  • Superconductors as spin sources for spintronics (literal)
Abstract
  • Spin-polarized transport is investigated in normal metal-superconductor (NS) junctions as a function of interface transmissivity as well as temperature when the density of states of a superconductor is Zeeman-split in response to an exchange field (h(exc)). Similarly to the 'absolute spin-valve effect' predicted by Huertas-Hernando [Phys. Rev. Lett. 88, 047003 (2002)] in superconducting proximity structures, we show that NS junctions can be used to generate highly spin-polarized currents, in alternative to half-metallic ferromagnets. In particular, the spin-polarized current obtained is largely tunable in magnitude and sign by acting on bias voltage and h(exc). While for tunnel contacts the current polarization can be as high as 100%, for transparent junctions it is dominated by the minority spin species. The effect can be enhanced by electron 'cooling' provided by the superconducting gap. (literal)
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