Current-induced transverse spin-wave instability in thin ferromagnets: Beyond linear stability analysis

被引：17

作者：

Adam, S ^{[1
]}

Polianski, ML ^{[1
]}

Brouwer, PW ^{[1
]}

机构：

[1] Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.73.024425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A sufficiently large unpolarized current can cause a spin-wave instability in thin nanomagnets with asymmetric contacts. The dynamics beyond the instability is understood in the perturbative regime of small spin-wave amplitudes, as well as by numerically solving a discretized model. In the absence of an applied magnetic field, our numerical simulations reveal a hierarchy of instabilities, leading to chaotic magnetization dynamics for the largest current densities we consider.

引用

页数：13

共 41 条

[1] Spin-torque switching: Fokker-Planck rate calculation [J].

Apalkov, DM ;

Visscher, PB .

PHYSICAL REVIEW B, 2005, 72 (18)

[2] Current-induced magnetization switching in small domains of different anisotropies [J].

Bazaliy, YB ;

Jones, BA ;

Zhang, SC .

PHYSICAL REVIEW B, 2004, 69 (09)

[3] Modification of the Landau-Lifshitz equation in the presence of a spin-polarized current in colossal- and giant-magnetoresistive materials [J].

Bazaliy, YB ;

Jones, BA ;

Zhang, SC .

PHYSICAL REVIEW B, 1998, 57 (06) :R3213-R3216

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

Berger, L .

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

[5] Transition from the macrospin to chaotic behavior by a spin-torque driven magnetization precession of a square nanoelement [J].

Berkov, D ;

Gorn, N .

PHYSICAL REVIEW B, 2005, 71 (05)

[6] Magnetization precession due to a spin-polarized current in a thin nanoelement: Numerical simulation study [J].

Berkov, DV ;

Gorn, NL .

PHYSICAL REVIEW B, 2005, 72 (09)

[7] Current-induced macrospin versus spin-wave excitations in spin valves [J].

Brataas, A ;

Tserkovnyak, Y ;

Bauer, GEW .

PHYSICAL REVIEW B, 2006, 73 (01)

[8] Finite-element theory of transport in ferromagnet-normal metal systems [J].

Brataas, A ;

Nazarov, YV ;

Bauer, GEW .

PHYSICAL REVIEW LETTERS, 2000, 84 (11) :2481-2484

[9] Current-driven switching in a single exchange-biased ferromagnetic layer [J].

Chen, TY ;

Ji, Y ;

Chien, CL ;

Stiles, MD .

PHYSICAL REVIEW LETTERS, 2004, 93 (02) :026601-1

[10] A phenomenological theory of damping in ferromagnetic materials [J].

Gilbert, TL .

IEEE TRANSACTIONS ON MAGNETICS, 2004, 40 (06) :3443-3449

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