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Landau-Lifshitz-Bloch equation for domain wall motion in antiferromagnets

机译：兰出Lifshitz-Bloch方程，用于域壁运动在反霉画中

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摘要

In this work, we derive the Landau-Lifshitz-Bloch equation accounting for the multidomain antiferromagnetic (AFM) lattice at finite temperature, in order to investigate the domain wall motion, the core issue for AFM spintronics. The continuity equation of the staggered magnetization is obtained using the continuum approximation, allowing an analytical calculation of the domain wall dynamics. The influence of temperature on the static domain wall profile is investigated, and the analytical calculations agree well with the numerical simulations on temperature-gradient-driven domain wall motion, confirming the validity of this theory. Furthermore, the decrease of the acceleration and the increase of the saturation velocity of the domain wall with the increase of temperature are uncovered for a fixed gradient. Moreover, it is worth noting that this theory could be also applied to dynamics of various wall motions in an AFM system. The present theory represents a comprehensive approach to the domain wall dynamics in AFM materials, a crucial step toward the development of AFM spintronics.
机译：在这项工作中，我们推导了Landau-Lifshitz-Bloch方程核算有限温度的多域反铁磁性（AFM）格子，以研究域壁运动，AFM闪光灯的核心问题。使用连续近似获得交错磁化的连续性方程，允许域壁动力学的分析计算。研究了温度对静域壁曲线的影响，分析计算与温度梯度驱动域壁运动的数值模拟很好，确认了该理论的有效性。此外，对于固定梯度，揭示了畴壁的加速度和域壁的饱和速度的增加的降低。此外，值得注意的是，该理论也可以应用于AFM系统中各种壁运动的动态。本理论代表了AFM材料中域墙体动力学的综合方法，这是朝着AFM闪蒸的发展的重要步骤。

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  • 来源
    《Physical review》 |2019年第21期|214436.1-214436.7|共7页
  • 作者

    Chen Z. Y.; Yan Z. R.; Qin M. H.; Liu J-M;

  • 作者单位

    South China Normal Univ Inst Adv Mat South China Acad Adv Optoelect Guangzhou 510006 Guangdong Peoples R China|South China Normal Univ Guangdong Prov Key Lab Quantum Engn & Quantum Mat Guangzhou 510006 Guangdong Peoples R China;

    South China Normal Univ Inst Adv Mat South China Acad Adv Optoelect Guangzhou 510006 Guangdong Peoples R China|South China Normal Univ Guangdong Prov Key Lab Quantum Engn & Quantum Mat Guangzhou 510006 Guangdong Peoples R China;

    South China Normal Univ Inst Adv Mat South China Acad Adv Optoelect Guangzhou 510006 Guangdong Peoples R China|South China Normal Univ Guangdong Prov Key Lab Quantum Engn & Quantum Mat Guangzhou 510006 Guangdong Peoples R China;

    South China Normal Univ Inst Adv Mat South China Acad Adv Optoelect Guangzhou 510006 Guangdong Peoples R China|South China Normal Univ Guangdong Prov Key Lab Quantum Engn & Quantum Mat Guangzhou 510006 Guangdong Peoples R China|Nanjing Univ Lab Solid State Microstruct Nanjing 210093 Jiangsu Peoples R China|Nanjing Univ Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

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