Bin Chen, Yuantu Long, Yulin Nie, Ziyu Ling, Tianping Ma, Ruixuan Zhang, Yizheng Wu, Yongming Luo, Ningning Wang
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引用次数: 0
摘要
在这项研究中,我们利用微磁模拟证明了倾斜垂直各向异性诱导的自旋轨道棘轮效应。在自旋轨道力矩(SOT)诱导的磁化切换过程中,在两种磁化状态(向上磁化和向下磁化)之间切换所需的临界电流是不对称的。此外,在纳米线结构中,倾斜各向异性诱导形成倾斜畴壁(DW)。倾斜畴壁在运动过程中表现出棘轮效应。通过改变相对于各向异性倾斜方向的电流方向,可以调整开关和 DW 运动过程中的棘轮效应。DW 的棘轮运动可用于模拟生物神经元的 "漏-并-火 "功能,尤其是 "电位 "和 "复位 "过程的不对称特性。我们的研究结果让人们充分了解了倾斜的垂直各向异性对 SOT 诱导的磁化切换和 DW 运动的影响,有利于设计更多基于 SOT 的器件。
Using micromagnetic simulations, in this study we demonstrate the tilted perpendicular anisotropy -induced spin-orbit ratchet effect. During spin-orbit torque (SOT)-induced magnetization switching, the critical currents required to switch between the two magnetization states (upward and downward magnetization) are asymmetric. In addition, in the nanowire structure, tilted anisotropy induces formation of tilted domain walls (DWs). The tilted DWs exhibit a ratchet behavior during motion. The ratchet effect during switching and DW motions can be tuned by changing the current direction with respect to the tilting direction of anisotropy. The ratchet motion of the DWs can be used to mimic the Leaky–Integrate–Fire function of a biological neuron, especially the asymmetric property of the “potential” and “reset” processes. Our results provide a full understanding of the influence of tilted perpendicular anisotropy on SOT-induced magnetization switching and DW motion, and are beneficial for design of further SOT-based devices.
期刊介绍:
Chinese Physics Letters provides rapid publication of short reports and important research in all fields of physics and is published by the Chinese Physical Society and hosted online by IOP Publishing.