Response to noise of a vortex based spin transfer nano-oscillator

被引：82

作者：

Grimaldi, Eva ^{[1
,2
,3
]}

Dussaux, Antoine ^{[1
,2
]}

Bortolotti, Paolo ^{[1
,2
,4
]}

Grollier, Julie ^{[1
,2
]}

Pillet, Gregoire ^{[4
]}

Fukushima, Akio ^{[5
]}

Kubota, Hitoshi ^{[5
]}

Yakushiji, Kay ^{[5
]}

Yuasa, Shinji ^{[5
]}

Cros, Vincent ^{[1
,2
]}

机构：

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

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

[3] CNES, F-31400 Toulouse, France

[4] Thales Res & Technol, F-91767 Palaiseau, France

[5] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 10期

关键词：

MICROWAVE OSCILLATIONS; DRIVEN; PHASE;

D O I：

10.1103/PhysRevB.89.104404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate experimentally and analytically the impact of thermal noise on the sustained gyrotropic mode of vortex magnetization in spin transfer nano-oscillators and its consequence on the linewidth broadening due to the different nonlinear contributions. Performing time domain measurements, we are able to extract separately the phase noise and the amplitude noise at room temperature for several values of dc current and perpendicular field. For a theoretical description, we extend the general model of nonlinear auto-oscillators to the case of vortex core dynamics and provide analytical expressions of the parameters describing the response to noise of the system. From the analysis of our experimental results, we demonstrate the major role of the amplitude-to-phase noise conversion on the linewidth broadening, and propose several solutions to increase even more the spectral coherence of vortex-based spin transfer nano-oscillators.

引用

页数：8

共 41 条

[1] Low-frequency and shot noises in CoFeB/MgO/CoFeB magnetic tunneling junctions [J].

Arakawa, Tomonori ;

Tanaka, Takahiro ;

Chida, Kensaku ;

Matsuo, Sadashige ;

Nishihara, Yoshitaka ;

Chiba, Daichi ;

Kobayashi, Kensuke ;

Ono, Teruo ;

Fukushima, Akio ;

Yuasa, Shinji .

PHYSICAL REVIEW B, 2012, 86 (22)

[2] Emission of spin waves by a magnetic multilayer traversed by a current [J].

Berger, L .

PHYSICAL REVIEW B, 1996, 54 (13) :9353-9358

[3] Direct experimental measurement of phase-amplitude coupling in spin torque oscillators [J].

Bianchini, L. ;

Cornelissen, S. ;

Kim, Joo-Von ;

Devolder, T. ;

van Roy, W. ;

Lagae, L. ;

Chappert, C. .

APPLIED PHYSICS LETTERS, 2010, 97 (03)

[4] Parametric excitation of magnetic vortex gyrations in spin-torque nano-oscillators [J].

Bortolotti, P. ;

Grimaldi, E. ;

Dussaux, A. ;

Grollier, J. ;

Cros, V. ;

Serpico, C. ;

Yakushiji, K. ;

Fukushima, A. ;

Kubota, H. ;

Matsumoto, R. ;

Yuasa, S. .

PHYSICAL REVIEW B, 2013, 88 (17)

[5] Temperature dependence of microwave voltage emission associated to spin-transfer induced vortex oscillation in magnetic tunnel junction [J].

Bortolotti, P. ;

Dussaux, A. ;

Grollier, J. ;

Cros, V. ;

Fukushima, A. ;

Kubota, H. ;

Yakushiji, K. ;

Yuasa, S. ;

Ando, K. ;

Fert, A. .

APPLIED PHYSICS LETTERS, 2012, 100 (04)

[6] Understanding eigenfrequency shifts observed in vortex gyrotropic motions in a magnetic nanodot driven by spin-polarized out-of-plane dc current [J].

Choi, Youn-Seok ;

Kim, Sang-Koog ;

Lee, Ki-Suk ;

Yu, Young-Sang .

APPLIED PHYSICS LETTERS, 2008, 93 (18)

[7] Single-domain circular nanomagnets [J].

Cowburn, RP ;

Koltsov, DK ;

Adeyeye, AO ;

Welland, ME ;

Tricker, DM .

PHYSICAL REVIEW LETTERS, 1999, 83 (05) :1042-1045

[8] Field dependence of spin-transfer-induced vortex dynamics in the nonlinear regime [J].

Dussaux, A. ;

Khvalkovskiy, A. V. ;

Bortolotti, P. ;

Grollier, J. ;

Cros, V. ;

Fert, A. .

PHYSICAL REVIEW B, 2012, 86 (01)

[9] Large microwave generation from current-driven magnetic vortex oscillators in magnetic tunnel junctions [J].

Dussaux, A. ;

Georges, B. ;

Grollier, J. ;

Cros, V. ;

Khvalkovskiy, A. V. ;

Fukushima, A. ;

Konoto, M. ;

Kubota, H. ;

Yakushiji, K. ;

Yuasa, S. ;

Zvezdin, K. A. ;

Ando, K. ;

Fert, A. .

NATURE COMMUNICATIONS, 2010, 1

[10]

Dussaux A., UNPUB

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