Dynamics of domain-wall motion driven by spin-orbit torque in antiferromagnets
Dynamics of domain-wall motion driven by spin-orbit torque in antiferromagnets
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DOI：
10.1103/physrevb.101.014433
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发表时间：
2019-04
影响因子：
3.7
通讯作者：
L. Sánchez-Tejerina;V. Puliafito;P. Amiri;M. Carpentieri;G. Finocchio
中科院分区：
文献类型：
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作者：
L. Sánchez-Tejerina;V. Puliafito;P. Amiri;M. Carpentieri;G. Finocchio
反铁磁材料中超快动力学的激发是实现自旋电子器件的一个吸引人的特点。一些实验表明，反铁磁序的静态和动态行为与多畴态的稳定及其畴壁的操纵密切相关。因此，一个完整的微磁框架应该作为一个全面的理论工具来定量理解这些实验结果。利用该模型对自旋轨道转矩驱动的反铁磁DW运动进行了数值实验研究。我们推导出了DW宽度和速度的简化表达式，在很宽的参数范围内与数值计算结果非常吻合。此外，我们发现限制反铁磁赛道存储器中最大适用电流的机制是从其边缘开始的连续域成核，这与铁磁情况下观察到的性质不同。
The excitation of ultrafast dynamics in antiferromagnetic materials is an appealing feature for the realization of spintronic devices. Several experiments have shown that static and dynamic behaviors of the antiferromagnetic order are strictly related to the stabilization of multidomain states and the manipulation of their domain walls (DWs). Hence, a full micromagnetic framework should be used as a comprehensive theoretical tool for a quantitative understanding of those experimental findings. This model is used to perform numerical experiments to study the antiferromagnetic DW motion driven by the spin-orbit torque. We have derived simplified expressions for the DW width and velocity that exhibit a very good agreement with the numerical calculations in a wide range of parameters. Additionally, we have found that a mechanism limiting the maximum applicable current in an antiferromagnetic racetrack memory is the continuous domain nucleation from its edges, which is qualitatively different from what observed in the ferromagnetic case.