Synchronization of spin Hall nano-oscillators to external microwave signals
Synchronization of spin Hall nano-oscillators to external microwave signals
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DOI：
10.1038/ncomms4179
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发表时间：
2014-01-01
影响因子：
16.6
通讯作者：
Urazhdin, S.
中科院分区：
文献类型：
--
作者：
Demidov, V. E.;Ulrichs, H.;Urazhdin, S.
最近，展示了一种由自旋霍尔效应产生的纯自旋电流驱动的新型自旋扭矩纳米振荡器。在这里，我们报告了外部微波信号对这些振荡器的影响的研究。我们的结果表明，通过施加大约两倍于自振荡频率的微波信号可以有效地同步它们，这为新型自旋电子器件的开发提供了额外的可能性。我们发现同步表现出一个阈值，该阈值由自旋电流泵浦到其热水平之上的磁涨落决定，并且受到自振荡模式的非线性自局域性质的显着影响。
Recently, a novel type of spin-torque nano-oscillators driven by pure spin current generated via the spin Hall effect was demonstrated. Here we report the study of the effects of external microwave signals on these oscillators. Our results show that they can be efficiently synchronized by applying a microwave signal at approximately twice the frequency of the auto-oscillation, which opens additional possibilities for the development of novel spintronic devices. We find that the synchronization exhibits a threshold determined by magnetic fluctuations pumped above their thermal level by the spin current, and is significantly influenced by the nonlinear self-localized nature of the auto-oscillatory mode.