Spin-transfer torque efficiency measured using a Permalloy nanobridge

Duncan Mcgrouther, M. C. Hickey, D. T. Ngo, S. Lepadatu, D. Atkinson, D. McGrouther, S. McVitie, C. H. Marrows

    Research output: Contribution to journalArticlepeer-review


    We report magnetoresistance, focused Kerr effect, and Lorentz microscopy experiments performed on a nanoscale Permalloy bridge connecting microscale pads. These pads can be switched from a parallel to antiparallel state through the application of small fields, causing a detectable magnetoresistance. We show that this switching field Hsw is modified by the application of a high current density (Jdc) through spin-transfer torque effects, caused by the spin-current interacting with the magnetization gradients generated by the device geometry, yielding an estimate for the spin-transfer torque efficiency =d Hsw /d Jdc =0.027±0.001 Oe/MA cm -2. © 2010 American Institute of Physics.
    Original languageEnglish
    Article number202505
    JournalApplied Physics Letters
    Issue number20
    Publication statusPublished - 15 Nov 2010


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