Parametric oscillator based on nonlinear vortex dynamics in low-resistance magnetic tunnel junctions

被引：24

作者：

Martin, S. Y. ^{[1
]}

de Mestier, N. ^{[1
]}

Thirion, C. ^{[2
,4
]}

Hoarau, C. ^{[2
,4
]}

Conraux, Y. ^{[3
]}

Baraduc, C. ^{[1
]}

Dieny, B. ^{[1
]}

机构：

[1] CEA INAC CNRS UJF Grenoble1 Grenoble INP, SPINTEC, UMR 8191, F-38054 Grenoble 9, France

[2] CNRS, Inst Neel, F-38042 Grenoble 9, France

[3] Crocus Technol, F-38025 Grenoble, France

[4] Univ Grenoble 1, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 14期

基金：

欧洲研究理事会;

关键词：

STATE;

D O I：

10.1103/PhysRevB.84.144434

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Radiofrequency vortex spin-transfer oscillators based on magnetic tunnel junctions with very low-resistance area product were investigated. A high power of excitations has been obtained characterized by a power spectral density containing a very sharp peak at the fundamental frequency and a series of harmonics. The observed behavior is ascribed to the combined effect of spin-transfer torque and Oersted-Ampere field generated by the large applied dc current. We furthermore show that the synchronization of a vortex oscillation by applying an ac bias current is mostly efficient when the external frequency is twice the oscillator fundamental frequency. This result is interpreted in terms of a parametric oscillator.

引用

页数：5

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