Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source
Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source
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DOI：
10.1063/1.4862326
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发表时间：
2014-01-13
影响因子：
4
通讯作者：
Cros, V.
中科院分区：
文献类型：
--
作者：
Hamadeh, A.;Locatelli, N.;Cros, V.
研究了自旋阀纳米柱中两个耦合涡的自旋转移驱动动力学产生的自振荡信号与外部源的同步。在大于振荡器频率10%的范围内，微波场h（rf）发生锁相，驱动幅值仅为几个欧斯特德。使用双频同步，发现与自由运行状态（140 kHz）相比，在锁相状态下（低至1 Hz，受频谱分析仪分辨率带宽限制），生成线宽度减少了五个数量级以上。这种完美的锁相适用于2兆赫的频率失谐，证明了它的鲁棒性。我们还分析了自由运行谱线宽度对同步系统主要特性的影响。(C) 2014 AIP出版有限责任公司
We study the synchronization of the auto-oscillation signal generated by the spin transfer driven dynamics of two coupled vortices in a spin-valve nanopillar to an external source. Phase-locking to the microwave field h(rf) occurs in a range larger than 10% of the oscillator frequency for drive amplitudes of only a few Oersteds. Using synchronization at the double frequency, the generation linewidth is found to decrease by more than five orders of magnitude in the phase-locked regime (down to 1 Hz, limited by the resolution bandwidth of the spectrum analyzer) in comparison to the free running regime (140 kHz). This perfect phase-locking holds for frequency detuning as large as 2 MHz, which proves its robustness. We also analyze how the free running spectral linewidth impacts the main characteristics of the synchronization regime. (C) 2014 AIP Publishing LLC.