Nucleation and dynamics of magnetic vortices under spin-polarized current

被引：22

作者：

Nakatani, Yoshinobu ^{[1
]}

Shibata, Junya ^{[2
]}

Tatara, Gen ^{[3
,4
]}

Kohno, Hiroshi ^{[5
]}

Thiaville, Andre ^{[6
]}

Miltat, Jacques ^{[6
]}

机构：

[1] Univ Electrocommun, Dept Comp Sci, Tokyo 1828585, Japan

[2] Kanagawa Inst Technol, Kanagawa 2430292, Japan

[3] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan

[4] JST, PRESTO, Kawaguchi, Saitama 3320012, Japan

[5] Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan

[6] Univ Paris 11, CNRS, Phys Solides Lab, F-91405 Orsay, France

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.77.014439

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spin-polarized current in a ferromagnet is known to lead to the instability of the uniformly magnetized state. In this paper, it is demonstrated by micromagnetic simulations that, in films or wide wires, the above instability is followed by the formation of magnetic vortices. Subsequent magnetization dynamics is also studied in terms of vortices, which includes pair dynamics and pair annihilation. Using a simple analytical model that considers the vortices as points, the dynamics of two interacting vortices under the current is classified according to their vorticity and polarity. This explains well the essential features of the simulation results.

引用

页数：7

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