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Spin-torque effects in thermally assisted magnetization reversal: Method of statistical moments

机译：热辅助磁化反转中的自旋转矩效应：统计矩的方法

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摘要

Thermal fluctuations of nanomagnets driven by spin-polarized currents are treated via the Landau-Lifshitz-Gilbert equation generalized to include both the random thermal noise field and the Slonczewski spin-transfer torque term. By averaging this stochastic (Langevin) equation over its realizations, the explicit infinite hierarchy of differential-recurrence relations for statistical moments (averaged spherical harmonics) is derived for arbitrary demagnetizing factors and magnetocrystalline anisotropy for the generic nanopillar model of a spin-torque device comprising two ferromagnetic strata representing the free and fixed layers and a nonmagnetic conducting spacer all sandwiched between two ohmic contacts. The influence of thermal fluctuations, and spin-transfer torques on relevant switching characteristics, such as the stationary magnetization, the magnetization reversal time, etc., is calculated by solving the hierarchy for wide ranges of temperature, damping, external magnetic field, and spin-polarized current, indicating new spin-torque effects in the thermally assisted magnetization reversal comprising several orders of magnitude. In particular, a pronounced dependence of the switching characteristics on the directions of the external magnetic field and the spin polarization exists.
机译：通过Landau-Lifshitz-Gilbert方程来处理由自旋极化电流驱动的纳米磁铁的热波动，该方程被推广为既包括随机热噪声场又包括Slonczewski自旋传递转矩项。通过在实现上对该随机（Langevin）方程进行平均，可以得出自旋转矩装置的通用纳米柱模型的任意退磁因子和磁晶各向异性的统计矩（平均球谐）微分递归关系的显式无限层次。两个铁磁层分别代表自由层和固定层，以及一个非磁性导电垫片，它们都夹在两个欧姆接触之间。通过求解宽范围的温度，阻尼，外部磁场和自旋的层次结构，可以计算出热涨落和自旋传递转矩对相关开关特性（如固定磁化，磁化反转时间等）的影响。极化电流，表明在热辅助磁化反转中新的自旋转矩效应，包括几个数量级。特别地，存在开关特性对外部磁场和自旋极化方向的明显依赖性。

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  • 来源
    《Physical review》 |2013年第14期|144406.1-144406.16|共16页
  • 作者

    Y. P. Kalmykov; W. T. Coffey; S. V. Titov; J. E. Wegrowe; D. Byrne;

  • 作者单位

    Laboratoire de Mathematiques et Physique, Universite de Perpignan Via Domitia, F-66860 Perpignan, France;

    Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland;

    Kotel'nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Vvedenskii Square 1, Fryazino, Moscow Region 141120, Russia;

    Laboratoire des Solides Irradies, Ecole Poly technique, 91128 Palaiseau Cedex, France;

    School of Physics, University College Dublin, Belfield, Dublin 4, Ireland;

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  • 正文语种 eng
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  • 关键词

    magnetization reversal mechanisms;

    机译：磁化反转机制;

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