Nonuniformity of a planar polarizer for spin-transfer-induced vortex oscillations at zero field

被引：44

作者：

Khvalkovskiy, A. V. ^{[1
,2
,3
]}

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

Locatelli, N. ^{[1
,2
]}

Gorbunov, Ya. V. ^{[3
]}

Zvezdin, K. A. ^{[3
,4
]}

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

机构：

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

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

[3] RAS, AM Prokhorov Gen Phys Inst, Moscow 119991, Russia

[4] Ist PM Srl, I-10122 Turin, Italy

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 21期

关键词：

chirality; electron spin polarisation; magnetisation; nanomagnetics; spin valves; vortices; DRIVEN;

D O I：

10.1063/1.3441405

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We discuss a possible mechanism of the spin-transfer-induced oscillations of a vortex in the free layer of spin-valve nanostructures, in which the polarizer layer has a planar magnetization. We demonstrate that if such planar polarizer is essentially nonuniform, steady gyrotropic vortex motion with large amplitude can be excited. The best excitation efficiency is obtained for a circular magnetization distribution in the polarizer. In this configuration, the conditions for the onset of the oscillations depend on the vortex chirality but not on the direction of its core. (C) 2010 American Institute of Physics. [doi:10.1063/1.3441405]

引用

页数：3

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