Current Induced Excitations in Cu/Co/Cu Single Ferromagnetic Layer Nanopillars

Details Current Induced Excitations in Cu/Co/Cu Single Ferromagnetic Layer Nanopillars Current Induced Excitations in Cu/Co/Cu Single Ferromagnetic Layer Nanopillars

2004-03-15

arxiv.org/abs/cond-mat/0403367v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.176604

Current-induced magnetic excitations in Cu/Co/Cu single layer nanopillars (~50 nm in diameter) have been studied experimentally as a function of Co layer thickness at low temperatures for large applied fields perpendicular to the layers. For asymmetric junctions current induced excitations are observed at high current densities for only one polarity of the current and are absent at the same current densities in symmetric junctions. These observations confirm recent predictions of spin-transfer torque induced spin wave excitations in single layer junctions with a strong asymmetry in the spin accumulation in the leads.

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