X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu

R. Kukreja, S. Bonetti, Z. Chen, D. Backes, Y. Acremann, J. A. Katine, A. D. Kent, H. A. Dürr, H. Ohldag, J. Stöhr

    Research output: Contribution to journalArticle

    Abstract

    We have used a MHz lock-in x-ray spectromicroscopy technique to directly detect changes in magnetic moment of Cu due to spin injection from an adjacent Co layer. The elemental and chemical specificity of x rays allows us to distinguish two spin current induced effects. We detect the creation of transient magnetic moments of 3×10-5μB on Cu atoms within the bulk of the 28 nm thick Cu film due to spin accumulation. The moment value is compared to predictions by Mott's two current model. We also observe that the hybridization induced existing magnetic moments at the Cu interface atoms are transiently increased by about 10% or 4×10-3μB per atom. This reveals the dominance of spin-torque alignment over Joule heat induced disorder of the interfacial Cu moments during current flow.

    Original languageEnglish (US)
    Article number096601
    JournalPhysical Review Letters
    Volume115
    Issue number9
    DOIs
    StatePublished - Aug 24 2015

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    magnetic moments
    x rays
    moments
    atoms
    torque
    alignment
    disorders
    injection
    heat
    predictions

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Kukreja, R., Bonetti, S., Chen, Z., Backes, D., Acremann, Y., Katine, J. A., ... Stöhr, J. (2015). X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu. Physical Review Letters, 115(9), [096601]. https://doi.org/10.1103/PhysRevLett.115.096601

    X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu. / Kukreja, R.; Bonetti, S.; Chen, Z.; Backes, D.; Acremann, Y.; Katine, J. A.; Kent, A. D.; Dürr, H. A.; Ohldag, H.; Stöhr, J.

    In: Physical Review Letters, Vol. 115, No. 9, 096601, 24.08.2015.

    Research output: Contribution to journalArticle

    Kukreja, R, Bonetti, S, Chen, Z, Backes, D, Acremann, Y, Katine, JA, Kent, AD, Dürr, HA, Ohldag, H & Stöhr, J 2015, 'X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu', Physical Review Letters, vol. 115, no. 9, 096601. https://doi.org/10.1103/PhysRevLett.115.096601
    Kukreja R, Bonetti S, Chen Z, Backes D, Acremann Y, Katine JA et al. X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu. Physical Review Letters. 2015 Aug 24;115(9). 096601. https://doi.org/10.1103/PhysRevLett.115.096601
    Kukreja, R. ; Bonetti, S. ; Chen, Z. ; Backes, D. ; Acremann, Y. ; Katine, J. A. ; Kent, A. D. ; Dürr, H. A. ; Ohldag, H. ; Stöhr, J. / X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu. In: Physical Review Letters. 2015 ; Vol. 115, No. 9.
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