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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Spin-dependent resonant quantum tunneling between magnetic nanoparticles on a macroscopic length scale

J. Varalda
  • Fonction : Auteur
C. A. Dartora
  • Fonction : Auteur
A. J. A. De Oliveira
  • Fonction : Auteur
W. A. Ortiz
  • Fonction : Auteur
B. Vodungbo
Massimiliano Marangolo
F. Vidal
G. G. Cabrera
  • Fonction : Auteur
D. H. Mosca
  • Fonction : Auteur

Résumé

Macroscopic quantum phenomena are common features observed in superconductors, superfluid helium, and Bose-Einstein condensates. However, most of quantum transport studies are based on a small number of dots and are not in long-range electron transport length scale. Here we show that spin-dependent resonant quantum tunneling is achieved in the macroscopic length scale (a few millimeters) corresponding to an array of up to 10(4) junctions in a series consisting of Co nanoparticles embedded in an oxygen-deficient TiO(2) matrix. This phenomenon is observed by magnetoresistance measurements at 5 K in a Coulomb blockade regime. We further present a model based on resonant spin-polarized quantum tunneling of electrons of Co particles. It occurs through resonant continuous spin-polarized defect band states located near the Fermi level of the defective TiO(2), which acts as a magnetic tunnel barrier. These results might be potentially useful for future designs of spintronic quantum devices.
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Dates et versions

hal-01240942 , version 1 (09-12-2015)

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Citer

J. Varalda, C. A. Dartora, A. J. A. De Oliveira, W. A. Ortiz, B. Vodungbo, et al.. Spin-dependent resonant quantum tunneling between magnetic nanoparticles on a macroscopic length scale. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83 (4), pp.045205. ⟨10.1103/PhysRevB.83.045205⟩. ⟨hal-01240942⟩
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