Spin-dependent tunneling with Coulomb blockade (original) (raw)

Physical Review B, 1997

Abstract

We have fabricated Co/Al2O3/Co tunnel junctions in which the Al2O3 layer includes a unique layer of small and disconnected cobalt clusters, with a typical mean diameter ranging from 2.0 to 4.0 nm. We observe spin-dependent tunneling properties with, below about 50 K, typical Coulomb-blockade effects induced by intermediate electron tunneling into cobalt clusters. The tunnel magnetoresistance ratio is approximately the

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