Spin-torque driven ferromagnetic resonance in a nonlinear regime

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

    Research output: Contribution to journalArticle

    Abstract

    Spin-valve based nanojunctions incorporating Co∫Ni multilayers with perpendicular anisotropy were used to study spin-torque driven ferromagnetic resonance (ST-FMR) in a nonlinear regime. Perpendicular field swept resonance lines were measured under a large amplitude microwave current excitation, which produces a large angle precession of the Co∫Ni layer magnetization. With increasing rf power the resonance lines broaden and become asymmetric, with their peak shifting to lower applied field. A nonhysteretic step jump in ST-FMR voltage signal was also observed at high powers. The results are analyzed in terms of the foldover effect of a forced nonlinear oscillator and compared to macrospin simulations. The ST-FMR nonhysteretic step response may have applications in frequency and amplitude tunable nanoscale field sensors.

    Original languageEnglish (US)
    Article number172513
    JournalApplied Physics Letters
    Volume95
    Issue number17
    DOIs
    StatePublished - 2009

    Fingerprint

    ferromagnetic resonance
    torque
    resonance lines
    precession
    oscillators
    microwaves
    magnetization
    anisotropy
    sensors
    electric potential
    excitation
    simulation

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Chen, W., De Loubens, G., Beaujour, J. M. L., Sun, J. Z., & Kent, A. D. (2009). Spin-torque driven ferromagnetic resonance in a nonlinear regime. Applied Physics Letters, 95(17), [172513]. https://doi.org/10.1063/1.3254242

    Spin-torque driven ferromagnetic resonance in a nonlinear regime. / Chen, W.; De Loubens, G.; Beaujour, J. M L; Sun, J. Z.; Kent, A. D.

    In: Applied Physics Letters, Vol. 95, No. 17, 172513, 2009.

    Research output: Contribution to journalArticle

    Chen, W, De Loubens, G, Beaujour, JML, Sun, JZ & Kent, AD 2009, 'Spin-torque driven ferromagnetic resonance in a nonlinear regime', Applied Physics Letters, vol. 95, no. 17, 172513. https://doi.org/10.1063/1.3254242
    Chen, W. ; De Loubens, G. ; Beaujour, J. M L ; Sun, J. Z. ; Kent, A. D. / Spin-torque driven ferromagnetic resonance in a nonlinear regime. In: Applied Physics Letters. 2009 ; Vol. 95, No. 17.
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