TITLE

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

AUTHOR(S)
Khvalkovskiy, A. V.; Grollier, J.; Locatelli, N.; Gorbunov, Ya. V.; Zvezdin, K. A.; Cros, V.
PUB. DATE
May 2010
SOURCE
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p212507
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
51059242

 

Related Articles

  • Oppositely rotating eigenmodes of spin-polarized current-driven vortex gyrotropic motions in elliptical nanodots. Ki-Suk Lee; Young-Sang Yu; Youn-Seok Choi; Dae-Eun Jeong; Sang-Koog Kim // Applied Physics Letters;5/12/2008, Vol. 92 Issue 19, p192514 

    The authors found that there exist two different rotational eigenmodes of oppositely rotating sense in spin-polarized current-driven vortex gyrotropic motions in soft magnetic elliptical nanodots. Simple mathematical expressions were analytically calculated by adopting vortex-core...

  • An Analysis of Acoustic Oscillations in Dust Plasma Structures. Samaryan, A. A.; Chernyshev, A. V.; Petrov, O. F.; Nefedov, A. P.; Fortov, V. E. // Journal of Experimental & Theoretical Physics;Mar2001, Vol. 92 Issue 3, p454 

    Low-frequency oscillations in the density of dust particles, which are spontaneously excited in the standing plasma column of a dc glow discharge in neon, were experimentally studied. The longitudinal waves were monitored by a special visualization technique, and the dust sound oscillation...

  • Large oscillations of the magnetoresistance in nanopatterned high-temperature superconducting films. Sochnikov, Ilya; Shaulov, Avner; Yeshurun, Yosef; Logvenov, Gennady; Božović, Ivan // Nature Nanotechnology;Jul2010, Vol. 5 Issue 7, p516 

    Measurements on nanoscale structures constructed from high-temperature superconductors are expected to shed light on the origin of superconductivity in these materials. To date, loops made from these compounds have had sizes of the order of hundreds of nanometres8–11. Here, we report the...

  • Excitation and suppression of oscillations in a chain of unidirectionally coupled elements with neuron-like dynamics. Skonzhenko, L. A.; Krasichkov, L. V. // Technical Physics Letters;Jun2007, Vol. 33 Issue 6, p483 

    The propagation of pulses in a model chain of Hindmarsh-Rose neurons with unidirectional coupling has been studied in the presence of intrinsic dynamics in chain elements. The main regimes of oscillations in the model chain are determined as dependent on the coupling parameter. The mechanisms of...

  • Unforced Oscillation of Rip-Current Vortex Cells. Geiman, Joseph D.; Kirby, James T. // Journal of Physical Oceanography;Mar2013, Vol. 43 Issue 3, p477 

    A numerical simulation of a monochromatic surface gravity wave-driven flow over an alongshore quasi-periodic rip-channeled beach using the wave-resolving model Funwave is used to investigate coherent, very low-frequency (VLF) motions with characteristic frequencies f < 4.0 mHz inside of the surf...

  • Controllable vortex polarity switching by spin polarized current. Jin, Wei; He, Huan; Chen, Yuguang; Liu, Yaowen // Journal of Applied Physics;Jan2009, Vol. 105 Issue 1, p013906 

    Nanopillars containing a perpendicular polarizer and a vortex free layer have been considered as promising structures for the selective switching of the vortex core by changing the spin polarized current direction. In this paper, two distinct switching routes of the vortex cores are found to be...

  • Spintronics: Change of direction. Cowburn, Russell P. // Nature Materials;Apr2007, Vol. 6 Issue 4, p255 

    The article comments on a research by Teruo Ono and others to demonstrate that an electrical current passing nanomatre-scale magnetic disk of permalloy (NiFe) has a strong influence on the disk magnetization. The researchers also revealed that an electrical current can displace the vortex core...

  • The passive optically pumped Rb frequency standard: the laser approach. Vanier, J.; Mandache, C. // Applied Physics B: Lasers & Optics;Jun2007, Vol. 87 Issue 4, p565 

    This paper outlines the progress made during the last few decades in the implementation of a frequency standard using the optical-microwave double resonance technique and laser optical pumping in a sealed cell containing an alkali atom vapor in a microwave cavity. An analysis is presented based...

  • The Enigma of B-type Pulsators in the SMC. Salmon, Sébastien; Montalbán, Josefina; Miglio, Andrea; Morel, Thierry; Dupret, Marc-Antoine; Noels, Arlette // AIP Conference Proceedings;9/16/2009, Vol. 1170 Issue 1, p385 

    Since the early nineties it is accepted that the excitation mechanism of B-type pulsators on the main sequence is due to the opacity peak in the iron-group elements at T≈200,000 K. The Fe content plays then a major role in the excitation of β Cep and SPB pulsations. While theoretical...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics