Bipolar high-field excitations in Co Cu Co nanopillars

B. Özyilmaz, A. D. Kent, M. J. Rooks, J. Z. Sun

    Research output: Contribution to journalArticlepeer-review


    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.

    Original languageEnglish (US)
    Article number140403
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Issue number14
    StatePublished - 2005

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics


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