Ferromagnetic resonance study of polycrystalline cobalt ultrathin films

J. M L Beaujour, W. Chen, A. D. Kent, J. Z. Sun

    Research output: Contribution to journalArticle

    Abstract

    We present room-temperature ferromagnetic resonance (FMR) studies of polycrystalline ∥Pt10 nm Cut Co10 nm CuPt∥ films as a function of Co layer thickness (1≤t≤10 nm) grown by evaporation and magnetron sputtering. FMR was studied with a high-frequency broadband coplanar waveguide (up to 25 GHz) using a flip-chip method. The resonance field and the linewidth were measured as functions of the ferromagnetic layer thickness. The evaporated films exhibit a lower magnetization density (Ms =1131 emu cm3) compared to the sputtered films (Ms =1333 emu cm3), with practically equal perpendicular surface anisotropy (Ks ≃-0.5 erg cm2). For both series of films, a strong increase of the linewidth was observed for Co layer thickness below 3 nm. For films with a ferromagnetic layer thinner than 4 nm, the damping of the sputtered films is larger than that of the evaporated films. The dependence of the linewidth can be understood in terms of the spin-pumping effect, from which the interface spin-mixing conductance is deduced.

    Original languageEnglish (US)
    Article number08N503
    JournalJournal of Applied Physics
    Volume99
    Issue number8
    DOIs
    StatePublished - 2006

    Fingerprint

    ferromagnetic resonance
    cobalt
    magnetron sputtering
    pumping
    sputtering
    damping
    chips
    evaporation
    broadband
    waveguides
    magnetization
    anisotropy
    room temperature

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)
    • Physics and Astronomy(all)

    Cite this

    Ferromagnetic resonance study of polycrystalline cobalt ultrathin films. / Beaujour, J. M L; Chen, W.; Kent, A. D.; Sun, J. Z.

    In: Journal of Applied Physics, Vol. 99, No. 8, 08N503, 2006.

    Research output: Contribution to journalArticle

    Beaujour, J. M L ; Chen, W. ; Kent, A. D. ; Sun, J. Z. / Ferromagnetic resonance study of polycrystalline cobalt ultrathin films. In: Journal of Applied Physics. 2006 ; Vol. 99, No. 8.
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