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.

引用

页数：4

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