Spin-torque-induced rotational dynamics of a magnetic vortex dipole

被引：37

作者：

Finocchio, G. ^{[1
]}

Ozatay, O. ^{[2
,3
]}

Torres, L. ^{[4
]}

Buhrman, R. A. ^{[3
]}

Ralph, D. C. ^{[3
]}

Azzerboni, B. ^{[1
]}

机构：

[1] Univ Messina, Dipartimento Fis Mat & Tecnol Fis Avanzate, I-98166 Messina, Italy

[2] Hitachi GST, San Jose Res Ctr, San Jose, CA 95135 USA

[3] Cornell Univ, Ithaca, NY 14853 USA

[4] Univ Salamanca, Dept Fis Aplicada, E-37008 Salamanca, Spain

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 17期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.78.174408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study, both experimentally and by numerical modeling, the magnetic dynamics that can be excited in a magnetic thin-film nanopillar device using the spin torque from a spatially localized current injected via a tens-of-nanometer-diameter aperture. The current-driven magnetic dynamics can produce large-amplitude microwave emission at zero magnetic field, with a frequency well below that of the uniform ferromagnetic resonance mode. Micromagnetic simulations indicate that the physical origin of this efficient microwave nano-oscillator is the nucleation and subsequent steady-state rotational dynamics of a magnetic vortex dipole driven by the localized spin torque. The results show that this implementation of a spintronic nano-oscillator is a promising candidate for microwave technology applications.

引用

页数：6

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