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Bidirectional spin-wave-driven domain wall motion in ferrimagnets

机译：双向旋转波驱动域壁运动在Ferrimagnets中

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摘要

We investigate ferrimagnetic domain-wall dynamics induced by circularly polarized spin waves theoretically and numerically. We find that the direction of domain-wall motion depends on both the circular polarization of spin waves and the sign of net spin density of the ferrimagnet. Below the angular momentum compensation point, left-circularly (right-circularly) polarized spin waves push a domain wall towards (away from) the spin-wave source. Above the angular momentum compensation point, on the other hand, the direction of domain-wall motion is reversed. This bidirectional motion originates from the fact that the sign of spin-wave-induced magnonic torque depends on the circular polarization and the subsequent response of the domain wall to the magnonic torque is governed by the net spin density. Our finding provides a way to utilize a spin wave as a versatile driving force for bidirectional domain-wall motion.
机译：我们研究了在理论上和数值上通过圆偏振旋转波引起的亚铁磁畴壁动力学。我们发现域壁运动的方向取决于旋转波的圆极化和Ferrimagnet的净自旋密度的符号。低于角动量补偿点，左圆形（右圆形）偏振旋转波将畴壁推向（远离）旋转波源。另一方面，在角动量补偿点上方，域壁运动的方向逆转。该双向运动源自：自旋波诱导的延长扭矩的符号取决于圆偏振的符号，并且畴壁与延长扭矩的后续响应由净自旋密度控制。我们的发现提供了一种利用旋转波作为双向域壁运动的多功能驱动力的方法。

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  • 来源
    《Physical review》 |2019年第17期|174403.1-174403.7|共7页
  • 作者

    Oh Se-Hyeok; Kim Se Kwon; Xiao Jiang; Lee Kyung-Jin;

  • 作者单位

    Korea Univ Dept Nanosemicond & Engn Seoul 02841 South Korea;

    Univ Missouri Dept Phys & Astron Columbia MO 65211 USA;

    Fudan Univ Dept Phys Shanghai 200433 Peoples R China|Fudan Univ State Key Lab Surface Phys Shanghai 200433 Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China|Fudan Univ Inst Nanoelect Devices & Quantum Comp Shanghai 200433 Peoples R China;

    Korea Univ Dept Nanosemicond & Engn Seoul 02841 South Korea|Korea Univ Dept Mat Sci & Engn Seoul 02841 South Korea|Korea Univ KU KIST Grad Sch Converging Sci & Technol Seoul 02841 South Korea;

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