Influence of non-uniform magnetization perturbation on spin-orbit torque measurements
Influence of non-uniform magnetization perturbation on spin-orbit torque measurements
复制标题
非均匀磁化扰动对自旋轨道扭矩测量的影响
DOI：
10.1016/j.jmmm.2022.169877
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发表时间：
2022
影响因子：
2.7
通讯作者：
Fan, Xin
中科院分区：
文献类型：
--
作者：
Greening, Ryan W.;Fan, Xin
在铁磁/双金属多层膜中的自旋-轨道力矩的测量通常基于这样的假设，即整个铁磁层均匀地响应于自旋-轨道力矩。当铁磁层的厚度与动态交换耦合长度相当时，这种假设就不成立了，动态交换耦合长度在某些测量几何形状中可以短到几纳米。非均匀磁化扰动与每个磁性子层对磁阻或克尔效应的非均匀贡献耦合，可能会影响自旋轨道扭矩外推的准确性，特别是如果使用厚铁磁层。在本文中，我们使用数值模型来调查这样的影响在三个不同的技术：磁光克尔效应的方法，二次谐波方法和自旋力矩铁磁共振方法。结果表明，二次谐波和磁光克尔效应方法容易受到非均匀磁化重取向的影响，而自旋矩铁磁共振方法受到的影响较小.
Measurements of spin–orbit torques in a ferromagnetic/nonmagnetic multilayer are typically based on an assumption that the entire ferromagnetic layer uniformly responds to the spin–orbit torque. This assumption breaks down when the thickness of the ferromagnetic layer is comparable to the dynamic exchange coupling length, which can be as short as a few nanometers in certain measurement geometries. The nonuniform magnetization perturbation coupled with nonuniform contribution of each magnetic sublayer to the magnetoresistance or the Kerr effect may impact the accuracy in the extrapolation of spin–orbit torque, particularly if a thick ferromagnetic layer is used. In this paper, we use numerical models to investigate such an impact in three different techniques: the magneto-optic-Kerr-effect method, the second-harmonic method and the spin torque ferromagnetic resonance method. We show that the second-harmonic and magneto-optic-Kerr-effect methods are prone to be influenced by the nonuniform magnetization reorientation, while the spin torque ferromagnetic resonance method is much less impacted.
影响因子：
38.3
作者：
Wenrui Wang;Tao Wang;V. Amin;Yangchao Wang;Anil Radhakrishnan;Angie Davidson;Shane R. Allen;T. Silva;H. Ohldag;D. Balzar;B. Zink;P. Haney;J. Xiao;D. Cahill;V. Lorenz;X. Fan
通讯作者：
Wenrui Wang;Tao Wang;V. Amin;Yangchao Wang;Anil Radhakrishnan;Angie Davidson;Shane R. Allen;T. Silva;H. Ohldag;D. Balzar;B. Zink;P. Haney;J. Xiao;D. Cahill;V. Lorenz;X. Fan
影响因子：
4.6
作者：
Karimeddiny, Saba;Mittelstaedt, Joseph A.;Ralph, Daniel C.
通讯作者：
Ralph, Daniel C.
影响因子：
16.6
作者：
Humphries AM;Wang T;Edwards ERJ;Allen SR;Shaw JM;Nembach HT;Xiao JQ;Silva TJ;Fan X
通讯作者：
Fan X