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Applied Physics Letters / Volume 96 / Issue 21 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 212507 (2010); doi:10.1063/1.3441405 (3 pages)

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

A. V. Khvalkovskiy1,2, J. Grollier1, N. Locatelli1, Ya. V. Gorbunov2, K. A. Zvezdin2,3, and V. Cros1

1Unité Mixte de Physique CNRS/Thales and Université Paris Sud 11, 1 ave A. Fresnel, 91767 Palaiseau, France
2A.M. Prokhorov General Physics Institute, RAS, Vavilova ul. 38, 119991 Moscow, Russia
3Istituto P.M. s.r.l., via Cernaia 24, 10122 Torino, Italy

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(Received 26 February 2010; accepted 8 May 2010; published online 28 May 2010)

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.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

chirality, electron spin polarisation, magnetisation, nanomagnetics, spin valves, vortices

PACS

  • 85.75.-d

    Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.3441405

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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