Parametric excitation of magnetic vortex gyrations in spin-torque nano-oscillators

被引：21

作者：

Bortolotti, P. ^{[1
,2
]}

Grimaldi, E. ^{[1
,2
,3
]}

Dussaux, A. ^{[1
,2
]}

Grollier, J. ^{[1
,2
]}

Cros, V. ^{[1
,2
]}

Serpico, C. ^{[4
]}

Yakushiji, K. ^{[5
]}

Fukushima, A. ^{[5
]}

Kubota, H. ^{[5
]}

Matsumoto, R. ^{[5
]}

Yuasa, S. ^{[5
]}

机构：

[1] Unite Mixte Phys CNRS Thales, F-91767 Palaiseau, France

[2] Univ Paris 11, F-91767 Palaiseau, France

[3] CNES, F-31400 Toulouse, France

[4] Univ Naples Federico II, Dipartimento Ingn Elettr &Tecnol Informaz, Naples, Italy

[5] Spintron Res Ctr, Inst Adv Ind Sci & Technol AIST, Tsukuba, Ibaraki, Japan

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 17期

关键词：

DRIVEN; DYNAMICS;

D O I：

10.1103/PhysRevB.88.174417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We experimentally demonstrate that large amplitude magnetic vortex gyrations can be parametrically excited by the injection of radio-frequency (rf) current at twice the natural frequency of the gyrotropic vortex-core motion. The mechanism of excitation is based on the parallel pumping of vortex motion by the rf orthoradial field generated by the injected current. Theoretical analysis shows that experimental results can be interpreted as the manifestation of parametric amplification when the rf current is small, and of parametric instability when the rf current is above a certain threshold. By taking into account the energy nonlinearities, we succeed to describe the amplitude saturation of vortex oscillations as well as the coexistence of stable regimes.

引用

页数：10

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