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First-principles study of magnon-phonon interactions in gadolinium iron garnet

机译：钆铁石榴石中菱镁 - 声子相互作用的第一原理研究

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摘要

We obtained the spin-wave spectrum based on a first-principles method of exchange constants, calculated the phonon spectrum by the first-principles phonon calculation method, and extracted the broadening of the magnon spectrum Δω, induced by magnon-phonon interactions in gadolinium iron garnet (GdIG). Using the obtained exchange constants, we reproduce the experimental Curie temperature and the compensation temperature from spin models using METROPOLIS Monte Carlo (MC) simulations. In the lower-frequency regime, the fitted positions of the magnon-phonon dispersion crossing points are consistent with the inelastic neutron scattering experiment. We found that the Δω and magnon wave vector k have a similar relationship in YIG. The broadening of the acoustic spin-wave branch (α mode) is proportional to k~2, while that of the optical branch (β and γ modes) is a constant. At a specific k, the magnon-phonon thermalization times of τ_(mp) are approximately 10~(-9), 10~(-13), and 10~(-14) s for α, β, and γ modes, respectively. The results show the importance of the higher frequency modes at room temperature. This research provides specific and effective information for developing a clear understanding of the spin-wave mediated spin Seebeck effect and complements the lack of lattice dynamics calculations of GdIG.
机译：我们基于交换常数的第一原理方法获得了自旋波谱，通过第一原理声子计算方法计算了声子谱，并提取了由钆铁中的Magnon-Phonon相互作用诱导的菱镁谱Δω的扩大石榴石（GDIG）。使用所获得的交换常数，我们使用Metropolis Monte Carlo（MC）模拟来重现实验居里温度和来自旋转模型的补偿温度。在较低频率的状态下，Magnon-Phonon色散交叉点的装配位置与非弹性中子散射实验一致。我们发现Δω和氧化氧元波矢量k在yig中具有类似的关系。声旋转波分支（α模式）的宽度与K〜2成比例，而光学分支（β和γ模式）的变化是恒定的。在特定的K中，对于α，β和γ模式，τ_（mp）的Magnon-phonon热化次数为约10〜（-9），10〜（-13）和10〜（-14）s 。结果表明较高频率模式在室温下的重要性。本研究提供了用于明确了解旋转波介导的SpineBeck效应的具体和有效的信息，并补充了GDIG的缺乏格子动力学计算。

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  • 来源
    《Physical review》 |2020年第16期|165137.1-165137.13|共13页
  • 作者

    Lian-Wei Wang; Li-Shan Xie; Peng-Xiang Xu; Ke Xia;

  • 作者单位

    The Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China;

    The Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China;

    Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518005 China;

    Beijing Computational Science Research Center Beijing 100193 China;

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