Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-02-07
Phys. Rev. B 74, 144408 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 Pages, 4 Figures
Scientific paper
10.1103/PhysRevB.74.144408
Spin transfer in asymmetric Co/Cu/Co bilayer magnetic nanopillars junctions has been studied at low temperature as a function of free-layer thickness. The phase diagram for current-induced magnetic excitations has been determined for magnetic fields up to 7.5 T applied perpendicular to the junction surface and free-layers thicknesses from 2 to 5 nm. The junction magnetoresistance is independent of thickness. The critical current for magnetic excitations decreases linearly with decreasing free-layer thickness, but extrapolates to a finite critical current in the limit of zero thickness. The limiting current is in quantitative agreement with that expected due to a spin-pumping contribution to the magnetization damping. It may also be indicative of a decrease in the spin-transfer torque efficiency in ultrathin magnetic layers.
Chen Wei
Kent Andrew D.
Rooks Michael J.
Ruiz Nieves
Sun Jin-Zuo
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