Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales

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 two-current-pulse temporal correlation experiment to study the intrinsic subnanosecond nonequilibrium magnetic dynamics of a nanomagnet during and following a pulse excitation. This method is applied to a model spin-transfer system, a spin-valve nanopillar with perpendicular magnetic anisotropy. Two pulses separated by a short delay (<500 ps) are shown to lead to the same switching probability as a single pulse with a duration that depends on the delay. This demonstrates a remarkable symmetry between magnetic excitation and relaxation and provides a direct measurement of the magnetic relaxation time. The results are consistent with a simple finite-temperature Fokker-Planck macrospin model of the dynamics, suggesting more coherent magnetization dynamics in this short-time nonequilibrium limit than near equilibrium.

    Original languageEnglish (US)
    Article number220405
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume85
    Issue number22
    DOIs
    StatePublished - Jun 19 2012

    Fingerprint

    Magnetic relaxation
    magnetic relaxation
    pulses
    Magnetic anisotropy
    Relaxation time
    Magnetization
    excitation
    relaxation time
    magnetization
    anisotropy
    symmetry
    Experiments
    Temperature
    temperature

    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. (2012). Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales. Physical Review B - Condensed Matter and Materials Physics, 85(22), [220405]. https://doi.org/10.1103/PhysRevB.85.220405

    Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales. / Liu, H.; Bedau, D.; Sun, J. Z.; Mangin, S.; Fullerton, E. E.; Katine, J. A.; Kent, A. D.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 22, 220405, 19.06.2012.

    Research output: Contribution to journalArticle

    Liu, H. ; Bedau, D. ; Sun, J. Z. ; Mangin, S. ; Fullerton, E. E. ; Katine, J. A. ; Kent, A. D. / Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 22.
    @article{fa66646c7e5642dc897dea661fdc19be,
    title = "Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales",
    abstract = "We present a two-current-pulse temporal correlation experiment to study the intrinsic subnanosecond nonequilibrium magnetic dynamics of a nanomagnet during and following a pulse excitation. This method is applied to a model spin-transfer system, a spin-valve nanopillar with perpendicular magnetic anisotropy. Two pulses separated by a short delay (<500 ps) are shown to lead to the same switching probability as a single pulse with a duration that depends on the delay. This demonstrates a remarkable symmetry between magnetic excitation and relaxation and provides a direct measurement of the magnetic relaxation time. The results are consistent with a simple finite-temperature Fokker-Planck macrospin model of the dynamics, suggesting more coherent magnetization dynamics in this short-time nonequilibrium limit than near equilibrium.",
    author = "H. Liu and D. Bedau and Sun, {J. Z.} and S. Mangin and Fullerton, {E. E.} and Katine, {J. A.} and Kent, {A. D.}",
    year = "2012",
    month = "6",
    day = "19",
    doi = "10.1103/PhysRevB.85.220405",
    language = "English (US)",
    volume = "85",
    journal = "Physical Review B-Condensed Matter",
    issn = "1098-0121",
    publisher = "American Physical Society",
    number = "22",

    }

    TY - JOUR

    T1 - Time-resolved magnetic relaxation of a nanomagnet on subnanosecond time scales

    AU - Liu, H.

    AU - Bedau, D.

    AU - Sun, J. Z.

    AU - Mangin, S.

    AU - Fullerton, E. E.

    AU - Katine, J. A.

    AU - Kent, A. D.

    PY - 2012/6/19

    Y1 - 2012/6/19

    N2 - We present a two-current-pulse temporal correlation experiment to study the intrinsic subnanosecond nonequilibrium magnetic dynamics of a nanomagnet during and following a pulse excitation. This method is applied to a model spin-transfer system, a spin-valve nanopillar with perpendicular magnetic anisotropy. Two pulses separated by a short delay (<500 ps) are shown to lead to the same switching probability as a single pulse with a duration that depends on the delay. This demonstrates a remarkable symmetry between magnetic excitation and relaxation and provides a direct measurement of the magnetic relaxation time. The results are consistent with a simple finite-temperature Fokker-Planck macrospin model of the dynamics, suggesting more coherent magnetization dynamics in this short-time nonequilibrium limit than near equilibrium.

    AB - We present a two-current-pulse temporal correlation experiment to study the intrinsic subnanosecond nonequilibrium magnetic dynamics of a nanomagnet during and following a pulse excitation. This method is applied to a model spin-transfer system, a spin-valve nanopillar with perpendicular magnetic anisotropy. Two pulses separated by a short delay (<500 ps) are shown to lead to the same switching probability as a single pulse with a duration that depends on the delay. This demonstrates a remarkable symmetry between magnetic excitation and relaxation and provides a direct measurement of the magnetic relaxation time. The results are consistent with a simple finite-temperature Fokker-Planck macrospin model of the dynamics, suggesting more coherent magnetization dynamics in this short-time nonequilibrium limit than near equilibrium.

    UR - http://www.scopus.com/inward/record.url?scp=84862665344&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84862665344&partnerID=8YFLogxK

    U2 - 10.1103/PhysRevB.85.220405

    DO - 10.1103/PhysRevB.85.220405

    M3 - Article

    VL - 85

    JO - Physical Review B-Condensed Matter

    JF - Physical Review B-Condensed Matter

    SN - 1098-0121

    IS - 22

    M1 - 220405

    ER -