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首页> 外文期刊>Physical review >Magnetization dynamics and damping due to electron-phonon scattering in a ferrimagnetic exchange model
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Magnetization dynamics and damping due to electron-phonon scattering in a ferrimagnetic exchange model

机译：亚铁交换模型中电子-声子散射引起的磁化动力学和阻尼

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摘要

We present a microscopic calculation of magnetization damping for a magnetic "toy model." The magnetic system consists of itinerant carriers coupled antiferromagnetically to a dispersionless band of localized spins, and the magnetization damping is due to coupling of the itinerant carriers to a phonon bath in the presence of spin-orbit coupling. Using a mean-field approximation for the kinetic exchange model and assuming the spin-orbit coupling to be of the Rashba form, we derive Boltzmann scattering integrals for the distributions and spin conherences in the case of an antiferromagnetic exchange splitting, including a careful analysis of the connection between lifetime broadening and the magnetic gap. For incoherent scattering of itinerant carriers with the phonon bath, i.e., the Elliott-Yafet mechanism, we extract dephasing and magnetization times T_1 and T_2 from initial conditions corresponding to a tilt of the magnetization vector and draw a comparison to phenomenological equations such as the Landau-Lifshitz (LL) or the Gilbert damping. We also analyze magnetization precession and damping for this system including an anisotropy field and find a carrier mediated dephasing of the localized spin via the mean-field coupling.
机译：我们介绍了磁性“玩具模型”的磁化阻尼的微观计算。磁系统由巡回载流子反铁磁耦合到局部自旋的无色带组成，磁化阻尼是由于在存在自旋轨道耦合的情况下巡回载流子与声子浴耦合。使用动力学交换模型的平均场近似并假设自旋轨道耦合为Rashba形式，我们得出反铁磁交换分裂情况下Boltzmann散射积分的分布和自旋相干性，包括对寿命延长与磁隙之间的联系。为了用声子浴（即Elliott-Yafet机理）对流动载流子进行非相干散射，我们从对应于磁化矢量倾斜的初始条件中提取了相移和磁化时间T_1和T_2，并与诸如Landau之类的现象学方程进行了比较-Lifshitz（LL）或吉尔伯特阻尼。我们还分析了包括各向异性场的该系统的磁化进动和阻尼，并通过平均场耦合找到了载流子对局部自旋的相移。

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  • 来源
    《Physical review》 |2014年第1期|014427.1-014427.13|共13页
  • 作者

    Alexander Baral; Svenja Vollmar; Hans Christian Schneider;

  • 作者单位

    Physics Department and Research Center OPTIMAS, Kaiserslautern University, P. O. Box 3049, 67663 Kaiserslautern, Germany;

    Physics Department and Research Center OPTIMAS, Kaiserslautern University, P. O. Box 3049, 67663 Kaiserslautern, Germany,Graduate School of Excellence Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, 67663 Kaiserslautern, Germany;

    Physics Department and Research Center OPTIMAS, Kaiserslautern University, P. O. Box 3049, 67663 Kaiserslautern, Germany;

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  • 正文语种 eng
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  • 关键词

    spin relaxation and scattering; general theory of resonances and relaxations;

    机译：自旋弛豫和散射;共振和松弛的一般理论;

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