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Physical Review B
Current-induced magnetic excitations in Co/Cu/Co bilayer nanopillars (∼50 nm in diameter) have been studied experimentally at low temperatures for large applied fields perpendicular to the layers. At sufficiently high current densities excitations, which lead to a decrease in differential resistance, are observed for both current polarities. Such bipolar excitations are not expected in a single domain model of spin-transfer. We propose that at high current densities strong asymmetries in thedoi:10.1103/physrevb.71.140403 fatcat:l6acsfp3zfbt3h3cnbdles5pbe