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Phys Rev Lett. 2003 Aug 08;91(6):067203. doi: 10.1103/PhysRevLett.91.067203. Epub 2003 Aug 08.

Current-induced magnetization reversal in high magnetic fields in Co/Cu/Co nanopillars.

Physical review letters

B Ozyilmaz, A D Kent, D Monsma, J Z Sun, M J Rooks, R H Koch

Affiliations

  1. Department of Physics, New York University, New York, New York 10003, USA.

PMID: 12935107 DOI: 10.1103/PhysRevLett.91.067203

Abstract

Current-induced magnetization dynamics in Co/Cu/Co trilayer nanopillars (approximately 100 nm in diameter) have been studied experimentally at low temperatures for large applied fields perpendicular to the layers. At 4.2 K an abrupt and hysteretic increase in resistance is observed at high current densities for one polarity of the current, comparable to the giant magnetoresistance effect observed at low fields. A micromagnetic model that includes a spin-transfer torque suggests that the current induces a complete reversal of the thin Co layer to alignment antiparallel to the applied field--that is, to a state of maximum magnetic energy.

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