Bipolar High Field Excitations in Co/Cu/Co Nanopillars
B. Özyilmaz, A. D. Kent, M. J. Rooks, J. Z. Sun
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 longitudinal 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.
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