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Publication
Physical Review B - CMMP
Paper
Bipolar high-field excitations in Co Cu Co nanopillars
Abstract
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 the spin accumulation cause spin-wave instabilities transverse to the current direction in bilayer samples, similar to those we have reported for single magnetic layer junctions. © 2005 The American Physical Society.