Bipolar High Field Excitations in Co/Cu/Co Nanopillars

Details Bipolar High Field Excitations in Co/Cu/Co Nanopillars Bipolar High Field Excitations in Co/Cu/Co Nanopillars

2004-07-08

arxiv.org/abs/cond-mat/0407210v1

Physical Review B RC 71, 140403 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures+ 2 additional jpg figures (Fig. 2d and Fig. 3) high resolution figures and recent related articles are avai

Scientific paper

10.1103/PhysRevB.71.140403

Current-induced magnetic excitations in Co/Cu/Co bilayer nanopillars ($\sim$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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