Spin-wave-beam driven synchronization of nanocontact spin-torque oscillators
Spin-wave-beam driven synchronization of nanocontact spin-torque oscillators
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DOI：
10.1038/nnano.2015.280
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发表时间：
2016-03-01
影响因子：
38.3
通讯作者：
Dumas, R. K.
中科院分区：
文献类型：
--
作者：
Houshang, A.;Iacocca, E.;Dumas, R. K.
多个纳米接触自旋扭矩振荡器（NC-STO）的同步是通过传播自旋波（SW）来介导的。尽管已经表明，在NC附近产生的奥斯特场可以显着改变SW的发射模式，但迄今为止其在多个NC的同步行为中的作用尚未被考虑。在这里，我们研究了垂直或水平方向的多个 NC-STO 相对于外部场的面内分量的同步行为。当 NC 由于高度各向异性的 SW 传播而垂直（水平）定向时，奥斯特场景观会促进（阻碍）同步。不仅在间隔大于 1,000 nm 时观察到两个振荡器之间的稳健同步，而且在垂直阵列几何结构中观察到多达五个振荡器的同步，这是一项新记录。此外，同步本质上不再被认为是相互的。
The synchronization of multiple nanocontact spin-torque oscillators (NC-STOs) is mediated by propagating spin waves (SWs). Although it has been shown that the Oersted field generated in the vicinity of the NC can dramatically alter the emission pattern of SWs, its role in the synchronization behaviour of multiple NCs has not been considered so far. Here we investigate the synchronization behaviour in multiple NC-STOs oriented either vertically or horizontally, with respect to the in-plane component of the external field. Synchronization is promoted (impeded) by the Oersted field landscape when the NCs are oriented vertically (horizontally) due to the highly anisotropic SW propagation. Not only is robust synchronization between two oscillators observed for separations larger than 1,000 nm, but synchronization of up to five oscillators, a new record, has been observed in the vertical array geometry. Furthermore, the synchronization can no longer be considered mutual in nature.