Observation of asymmetry in domain wall velocity under transverse magnetic field
Observation of asymmetry in domain wall velocity under transverse magnetic field
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DOI：
10.1063/1.4944897
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发表时间：
2016-03
期刊：
影响因子：
6.1
通讯作者：
Kab-Jin Kim;Y. Yoshimura;T. Okuno;T. Moriyama;Sun-hyun Lee;Kyoung Jin Lee;Y. Nakatani;T. Ono-
中科院分区：
文献类型：
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作者：
Kab-Jin Kim;Y. Yoshimura;T. Okuno;T. Moriyama;Sun-hyun Lee;Kyoung Jin Lee;Y. Nakatani;T. Ono-
研究了在横向磁场Hy作用下二维（2D） Co/Ni微带中存在Dzyaloshinskii-Moriya相互作用（DMI）且DMI矢量D位于+y方向的磁畴壁（DW）动力学。DW速度在±Hy时表现出不对称行为；在二维微磁模拟中重现了关键实验结果，表明界面DMI抑制了平均DW角φ的周期性变化，即使在Walker击穿以上，Hy也会改变φ，导致速度不对称。这表明二维DW运动，尽管其微观复杂性，仅仅取决于DW的平均角度，因此可以用一维孤子模型来描述。这些发现提供了对二维系统中磁性DW动力学的深入了解，这对于新兴的自旋轨道应用非常重要。
The dynamics of a magnetic domain wall (DW) under a transverse magnetic field Hy are investigated in two-dimensional (2D) Co/Ni microstrips, where an interfacial Dzyaloshinskii-Moriya interaction (DMI) exists with DMI vector D lying in +y direction. The DW velocity exhibits asymmetric behavior for ±Hy; that is, the DW velocity becomes faster when Hy is applied antiparallel to D. The key experimental results are reproduced in a 2D micromagnetic simulation, which reveals that the interfacial DMI suppresses the periodic change of the average DW angle φ even above the Walker breakdown and that Hy changes φ, resulting in a velocity asymmetry. This suggests that the 2D DW motion, despite its microscopic complexity, simply depends on the average angle of the DW and thus can be described using a one-dimensional soliton model. These findings provide insight into the magnetic DW dynamics in 2D systems, which are important for emerging spin-orbitronic applications.