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arXiv 2102.01311cond-mat.mes-hall
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磁场驱动的反铁磁畴壁运动

Magnetic-Field-Driven Antiferromagnetic Domain Wall Motion

Jotaro J. Nakane, Hiroshi Kohno

摘要:

从理论上研究了非均匀外磁场驱动下的反铁磁畴壁运动。首先用Néel矢量,然后用畴壁的集体坐标,导出了非均匀磁场下反铁磁自旋的拉格朗日量和运动方程。一个解决方案被发现,描述了由一个不均匀的字段,其中的运动是由壁磁化,然后由斯特恩-格拉赫驱动力的顺磁响应发起的磁畴壁的驱动。研究了钉扎电位的影响。这些结果与原子模拟结果吻合得很好。虽然本公式包含与Néel织构相关的所谓内禀磁化,但给出了补充讨论,以在没有内禀磁化的情况下根据物理磁化重新制定理论。

英文摘要:

We theoretically study the antiferromagnetic domain wall motion actuated by an inhomogeneous external magnetic field. The Lagrangian and the equations of motion of antiferromagnetic spins under an inhomogeneous magnetic field are derived, first in terms of the Néel vector, and then using collective coordinates of the domain wall. A solution is found that describes the actuation of a domain wall by an inhomogeneous field, in which the motion is initiated by a paramagnetic response of wall magnetization, which is then driven by a Stern-Gerlach like force. The effects of pinning potential are also investigated. These results are in good agreement with atomistic simulations. While the present formulation contains the so-called intrinsic magnetization associated with Néel texture, a supplementary discussion is given to reformulate the theory in terms of physical magnetization without the intrinsic magnetization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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