Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/74380
Type: Artigo de periódico
Title: Spin-dependent resonant quantum tunneling between magnetic nanoparticles on a macroscopic length scale
Author: Varalda, J
Dartora, CA
de Oliveira, AJA
Ortiz, WA
Vodungbo, B
Marangolo, M
Vidal, F
Zheng, Y
Cabrera, GG
Mosca, DH
Abstract: 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.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.83.045205
Date Issue: 2011
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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