Current-Induced Magnetization Reversal in High Magnetic Fields in Co/Cu/Co Nanopillars

Details Current-Induced Magnetization Reversal in High Magnetic Fields in Co/Cu/Co Nanopillars Current-Induced Magnetization Reversal in High Magnetic Fields in Co/Cu/Co Nanopillars

2003-01-17

arxiv.org/abs/cond-mat/0301324v4

Phys. Rev. Lett. 91, 067203 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures, (submitted to Phys. Rev. Lett.), added missing figure caption of fig. 3, updated to published version

Scientific paper

10.1103/PhysRevLett.91.067203

Current-induced magnetization dynamics in Co/Cu/Co trilayer nanopillars (~100nm in diameter) has been studied experimentally for large applied fields perpendicular to the layers. An abrupt and hysteretic increase in dynamic 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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