Spin-Dependent Tunneling in Self-Assembled Cobalt-Nanocrystal Superlattices

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Science  10 Nov 2000:
Vol. 290, Issue 5494, pp. 1131-1134
DOI: 10.1126/science.290.5494.1131

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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 increasing temperature and bias-voltage.

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