H.D. Dulman, R.H. Pantell, et al.
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 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.
H.D. Dulman, R.H. Pantell, et al.
Physical Review B
Frank Stem
C R C Critical Reviews in Solid State Sciences
A. Krol, C.J. Sher, et al.
Surface Science
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SPIE Advanced Lithography 2007