Long-range mutual synchronization of spin Hall nano-oscillators
Long-range mutual synchronization of spin Hall nano-oscillators
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DOI：
10.1038/nphys3927
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发表时间：
2017-03-01
期刊：
影响因子：
19.6
通讯作者：
Akerman, J.
中科院分区：
文献类型：
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作者：
Awad, A. A.;Durrenfeld, P.;Akerman, J.
具有自旋-轨道耦合的非磁性金属中的自旋霍尔效应将横向自旋电流注入到相邻的磁性层中，其中所产生的自旋转移力矩可以驱动自旋波自振荡。这种自旋霍尔纳米振荡器（SHNO）作为极其紧凑和宽带微波信号发生器和磁振子自旋波注入器具有很大的前景。在这里，我们表明，SHNO也可以以前所未有的效率相互同步。我们展示了多达9个单独的SHNO的相互同步，每个分离300 nm。通过进一步调整连接区域，我们可以将同步范围扩展到4 μ m。的相互同步，观察电的微波信号的功率和相干性的增加，并确认光学使用微布里渊光散射显微镜作为两个自旋波区域共享相同的光谱内容，与我们的微磁模拟。
The spin Hall effect in a non-magnetic metal with spin-orbit coupling injects transverse spin currents into adjacent magnetic layers, where the resulting spin transfer torque can drive spin wave auto-oscillations. Such spin Hall nano-oscillators (SHNOs) hold great promise as extremely compact and broadband microwave signal generators and magnonic spin wave injectors. Here we show that SHNOs can also be mutually synchronized with unprecedented efficiency. We demonstrate mutual synchronization of up to nine individual SHNOs, each separated by 300 nm. Through further tailoring of the connection regions we can extend the synchronization range to 4 mu m. The mutual synchronization is observed electrically as an increase in the power and coherence of the microwave signal, and confirmed optically using micro-Brillouin light scattering microscopy as two spin wave regions sharing the same spectral content, in agreement with our micromagnetic simulations.