Dynamics of spin torque switching in all-perpendicular spin valve nanopillars

H. Liu, D. Bedau, J. Z. Sun, S. Mangin, E. E. Fullerton, J. A. Katine, A. D. Kent

    Research output: Contribution to journalArticle

    Abstract

    We present a systematic experimental study of the spin-torque-induced magnetic switching statistics at room temperature, using all-perpendicularly magnetized spin-valves as a model system. Three physical regimes are distinguished: a short-time ballistic limit below a few nanoseconds, where spin-torque dominates the reversal dynamics from a thermal distribution of initial conditions; a long time limit, where the magnetization reversal probability is determined by spin-torque-amplified thermal activation; and a cross-over regime, where the spin-torque and thermal agitation both contribute. For a basic quantitative understanding of the physical processes involved, an analytical macrospin model is presented which contains both spin-torque dynamics and finite temperature effects. The latter was treated rigorously using a Fokker-Plank formalism, and solved numerically for specific sets of parameters relevant to the experiments to determine the switching probability behavior in the short-time and cross-over regimes. This analysis shows that thermal fluctuations during magnetization reversal greatly affect the switching probability over all the time scales studied, even in the short-time limit.

    Original languageEnglish (US)
    Pages (from-to)233-258
    Number of pages26
    JournalJournal of Magnetism and Magnetic Materials
    Volume358-359
    DOIs
    StatePublished - May 2014

    Fingerprint

    torque
    Torque
    Magnetization reversal
    magnetic switching
    magnetization
    Ballistics
    agitation
    Thermal effects
    Analytical models
    thermal energy
    ballistics
    Chemical activation
    temperature effects
    Statistics
    statistics
    activation
    Hot Temperature
    formalism
    room temperature
    Experiments

    Keywords

    • Ballistic magnetization reversal
    • Giant magnetoresistance
    • Macrospin dynamics
    • Magnetic random access memory
    • Magnetization dynamics
    • Magnetization reversal
    • Perpendicular magnetic anisotropy
    • Spin transfer torque
    • Spin transfer torque switching
    • Spin valve
    • Spintronics

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Liu, H., Bedau, D., Sun, J. Z., Mangin, S., Fullerton, E. E., Katine, J. A., & Kent, A. D. (2014). Dynamics of spin torque switching in all-perpendicular spin valve nanopillars. Journal of Magnetism and Magnetic Materials, 358-359, 233-258. https://doi.org/10.1016/j.jmmm.2014.01.061

    Dynamics of spin torque switching in all-perpendicular spin valve nanopillars. / Liu, H.; Bedau, D.; Sun, J. Z.; Mangin, S.; Fullerton, E. E.; Katine, J. A.; Kent, A. D.

    In: Journal of Magnetism and Magnetic Materials, Vol. 358-359, 05.2014, p. 233-258.

    Research output: Contribution to journalArticle

    Liu, H, Bedau, D, Sun, JZ, Mangin, S, Fullerton, EE, Katine, JA & Kent, AD 2014, 'Dynamics of spin torque switching in all-perpendicular spin valve nanopillars', Journal of Magnetism and Magnetic Materials, vol. 358-359, pp. 233-258. https://doi.org/10.1016/j.jmmm.2014.01.061
    Liu, H. ; Bedau, D. ; Sun, J. Z. ; Mangin, S. ; Fullerton, E. E. ; Katine, J. A. ; Kent, A. D. / Dynamics of spin torque switching in all-perpendicular spin valve nanopillars. In: Journal of Magnetism and Magnetic Materials. 2014 ; Vol. 358-359. pp. 233-258.
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