Spin-transfer in magnetic metallic nanopillars

Andrew D. Kent

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    I will present experiments on spin-transfer induced magnetization reversal and excitations in magnetic metallic nanopillars. For these studies, sub-micron lateral dimension (∼50nm) pillar devices have been fabricated by means of a new nano-stencil mask process ideal for systematic variation of layer composition and thickness [1]. My talk will address three aspects of the physics of spin-transfer: (A) The phase-diagram for magnetic switching in bilayer (Co/Cu/Co) nanopillars in large magnetic fields applied perpendicular to the plane of the layers [2]; (B) Current-induced excitations in single Cobalt ferromagnetic layer (Cu/Co/Cu) nanopillars (i.e., in structures without a fixed spin-polarizing magnetic reference layer) [3]; and (C) the dependence of the switching current on free magnetic layer thicknesses in bilayer structures. In latter case, the thickness of a Cobalt layer has been systematically varied from 0.5 to 4 nm. However, the slope of the switching current, dIc/dH, is found to have only a weak dependence on this thickness at low temperature (4.2 K), in contrast to the linear thickness dependence expected in the original model of spin-transfer [4|. I will discuss interpretations of this behavior, including the possible importance of spin-pumping induced magnetic damping in these ultra-thin free magnetic layers.

    Original languageEnglish (US)
    Title of host publicationINTERMAG ASIA 2005
    Subtitle of host publicationDigests of the IEEE International Magnetics Conference
    PublisherIEEE Computer Society
    Number of pages1
    ISBN (Print)0780390091, 9780780390096
    StatePublished - 2005
    EventINTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference - Nagoya, Japan
    Duration: Apr 4 2005Apr 8 2005

    Publication series

    NameINTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference


    OtherINTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference

    ASJC Scopus subject areas

    • General Engineering


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