2000
DOI: 10.1126/science.290.5494.1131
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Spin-Dependent Tunneling in Self-Assembled Cobalt-Nanocrystal Superlattices

Abstract: Self-assembled devices composed of periodic arrays of 10-nanometer-diameter cobalt nanocrystals display spin-dependent electron transport. Current-voltage characteristics are well described by single-electron tunneling in a uniform array. At temperatures below 20 kelvin, device magnetoresistance ratios are on the order of 10%, approaching the maximum predicted for ensembles of cobalt islands with randomly oriented preferred magnetic axes. Low-energy spin-flip scattering suppresses magnetoresistance with increa… Show more

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Cited by 645 publications
(524 citation statements)
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“…Although, this theory was developed for nanocrystal arrays of uniform sizes (monodisperse array), however, experimentally it was found to be true for polydispersed array as well [30,31]. From the fits, we obtain α = 3.1, 3.3 and 3.4 at 4.2 K, 10 K, and 15 K respectively.…”
Section: Theoretical Studies Of Qd Arrays By Middleton and Wingreen (mentioning
confidence: 86%
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“…Although, this theory was developed for nanocrystal arrays of uniform sizes (monodisperse array), however, experimentally it was found to be true for polydispersed array as well [30,31]. From the fits, we obtain α = 3.1, 3.3 and 3.4 at 4.2 K, 10 K, and 15 K respectively.…”
Section: Theoretical Studies Of Qd Arrays By Middleton and Wingreen (mentioning
confidence: 86%
“…Neglecting the size variation for the time being, C Σ can also be estimated from the geometrical consideration and can be written as Here, r is the radius of GQD, 2d is spacing between QDs, ε is the dielectric constant of RGO, 0 ε is value for permittivity of vacuum, and the factor 9 is the average number of nearest neighbors of each QD in a quasi 2D system [31,38]. The factor 9 was estimated as follows; For 2 D and 3 D hexagonal arrays, each nanocrystal has between 6 and 12 nearest neighbors.…”
Section: Theoretical Studies Of Qd Arrays By Middleton and Wingreen (mentioning
confidence: 99%
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“…M agnetic materials remain under intense investigation as they are technologically important in many areas ranging from microelectronics to medicine [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . As a result, the continued discovery of new magnetic systems is of both fundamental scientific and practical importance.…”
mentioning
confidence: 99%
“…The structure of these lattices could be changed from square to hexagonal by changing the nature of the ligand. Transport measurements performed on these samples [14] indicated the occurence of Coulomb blockade for temperatures below 70 K. However, due to the great number of tunneling paths, no Coulomb staircase was observed.…”
mentioning
confidence: 99%