title: 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 increasing temperature and bias-voltage.
authors.affiliation: IBM Research Division, T. J. Watson Research Center, Yorktown Heights, NY 10598, USA. ctblack@us.ibm.com
authors.forename: C T
authors.initials: CT
authors.lastname: Black
authors.forename: C B
authors.initials: CB
authors.lastname: Murray
authors.forename: R L
authors.initials: RL
authors.lastname: Sandstrom
authors.forename: S
authors.initials: S
authors.lastname: Sun