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Science 10 November 2000:
Vol. 290. no. 5494, pp. 1131 - 1134
DOI: 10.1126/science.290.5494.1131
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Reports

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

C. T. Black,* C. B. Murray, R. L. Sandstrom, Shouheng Sun

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.

IBM Research Division, T. J. Watson Research Center, Yorktown Heights, NY 10598, USA.
*   To whom correspondence should be addressed. E-mail: ctblack{at}us.ibm.com

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