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Spontaneous anomalous and spin Hall effects due to spin-orbit scattering of evanescent wave functions in magnetic tunnel junctions.
Vedyayev, A; Ryzhanova, N; Strelkov, N; Dieny, B.
Affiliation
  • Vedyayev A; Department of Physics, Moscow Lomonosov State University, Moscow 119991, Russia and SPINTEC, UMR 8191 CEA-INAC/CNRS/UJF-Grenoble 1/Grenoble-INP, 38054 Grenoble, France.
  • Ryzhanova N; Department of Physics, Moscow Lomonosov State University, Moscow 119991, Russia and SPINTEC, UMR 8191 CEA-INAC/CNRS/UJF-Grenoble 1/Grenoble-INP, 38054 Grenoble, France.
  • Strelkov N; Department of Physics, Moscow Lomonosov State University, Moscow 119991, Russia and SPINTEC, UMR 8191 CEA-INAC/CNRS/UJF-Grenoble 1/Grenoble-INP, 38054 Grenoble, France.
  • Dieny B; SPINTEC, UMR 8191 CEA-INAC/CNRS/UJF-Grenoble 1/Grenoble-INP, 38054 Grenoble, France.
Phys Rev Lett ; 110(24): 247204, 2013 Jun 14.
Article in En | MEDLINE | ID: mdl-25165958
ABSTRACT
We theoretically investigated the anomalous Hall effect (AHE) and spin Hall effect (SHE) transversal to the insulating spacer I, in magnetic tunnel junctions of the form F/I/F where the F's are ferromagnetic layers and I represents a tunnel barrier. We considered the case of purely ballistic (quantum mechanical) transport. These effects arise because of the asymmetric scattering of evanescent wave functions due to the spin-orbit interaction in the tunnel barrier. The AHE and SHE we investigated have a surface nature due to the proximity effect. Their amplitude is of first order in the scattering potential. This contrasts with ferromagnetic metals wherein these effects are of second (side-jump scattering) and third (skew scattering) order in these potentials. The value of the AHE current in the insulating spacer may be much larger than that in metallic ferromagnetic electrodes. For the antiparallel orientation of the magnetizations in the two F electrodes, a spontaneous Hall current exists even at zero applied voltage.
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Database: MEDLINE Language: En Year: 2013 Type: Article
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Database: MEDLINE Language: En Year: 2013 Type: Article