横向磁化的NiFe纳米线中自旋霍尔效应驱动的磁化动力学的微聚焦布里渊光散射研究
Micro-focused Brillouin light scattering study of the magnetization dynamics driven by Spin Hall effect in a transversely magnetized NiFe nanowire
摘要：
利用微聚焦布里渊光散射技术研究了横向磁化的Pt（4 nm）/NiFe（4 nm）/SiO2（5 nm）层状纳米线（横向尺寸为500 × 2750 nm 2）中由自旋霍尔效应产生的纯自旋电流对热自旋波本征模的放大作用。中心（基本）和边缘自旋波模式的频率和横截面已被测量作为注入的直流电流的强度的函数。这两种模式的频率表现出明显的红移，而它们的截面大大增加注入直流的强度。一个阈值样的行为被观察到的注入直流的值为2.8 mA。有趣的是，一个额外的模式，本地化的纳米线的中心部分，出现在更高的频率上增加的强度注入直流阈值以上。微磁学模拟被用来定量再现实验结果，并调查复杂的非线性动力学引起的自旋霍尔效应，包括修改的空间轮廓的自旋波模式和外观的额外模式以上的阈值。
英文摘要：
We employed micro-focused Brillouin light scattering to study the amplification of the thermal spin wave eigenmodes by means of a pure spin current, generated by the spin-Hall effect, in a transversely magnetized Pt(4nm)/NiFe(4nm)/SiO2(5nm) layered nanowire with lateral dimensions 500x2750 nm2. The frequency and the cross section of both the center (fundamental) and the edge spin wave modes have been measured as a function of the intensity of the injected dc electric current. The frequency of both modes exhibits a clear redshift while their cross section is greatly enhanced on increasing the intensity of the injected dc. A threshold-like behavior is observed for a value of the injected dc of 2.8 mA. Interestingly an additional mode, localized in the central part of the nanowire, appears at higher frequency on increasing the intensity of the injected dc above the threshold value. Micromagnetic simulations were used to quantitatively reproduce the experimental results and to investigate the complex non-linear dynamics induced by the spin-Hall effect, including the modification of the spatial profile of the spin wave modes and the appearance of the extra mode above the threshold.
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