Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source

被引：37
|
作者：
Hamadeh, A. [1 ]
Locatelli, N. [2 ,3 ]
Naletov, V. V. [1 ,2 ,3 ,4 ]
Lebrun, R. [2 ,3 ]
de Loubens, G. [1 ]
Grollier, J. [2 ,3 ]
Klein, O. [1 ]
Cros, V. [2 ,3 ]
机构：
[1] CEA Saclay, Serv Phys Etat Condense, CNRS, URA 2464, F-91191 Gif Sur Yvette, France
[2] CNRS Thales, Unite Mixte Phys, F-91767 Palaiseau, France
[3] Univ Paris 11, F-91767 Palaiseau, France
[4] Kazan Fed Univ, Inst Phys, Kazan 420008, Russia
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 02期
关键词：
POLARIZED CURRENT; TORQUE OSCILLATOR; DRIVEN;
D O I：
10.1063/1.4862326
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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.
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页数：4
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