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Bifurcation and chaos in spin-valve pillars in a periodic applied magnetic field

Chaos 19, 043111 (2009); doi:10.1063/1.3258365

Published 3 November 2009

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S. Murugesh1 and M. Lakshmanan2
1Department of Physics and Meteorology, IIT-Kharagpur, Kharagpur 721302, India
2Centre for Nonlinear Dynamics, School of Physics, Bharathidasan University, Tiruchirapalli 620024, India
We study the bifurcation and chaos scenario of the macromagnetization vector in a homogeneous nanoscale-ferromagnetic thin film of the type used in spin-valve pillars. The underlying dynamics is described by a generalized Landau–Lifshitz–Gilbert (LLG) equation. The LLG equation has an especially appealing form under a complex stereographic projection, wherein the qualitative equivalence of an applied field and a spin-current induced torque is transparent. Recently, chaotic behavior of such a spin vector has been identified by Li et al. [ Phys. Rev. B 74, 054417 (2006)] using a spin-polarized current passing through the pillar of constant polarization direction and periodically varying magnitude, owing to the spin-transfer torque effect. In this paper, we show that the same dynamical behavior can be achieved using a periodically varying applied magnetic field in the presence of a constant dc magnetic field and constant spin current, which is technically much more feasible, and demonstrate numerically the chaotic dynamics in the system for an infinitely thin film. Further, it is noted that in the presence of a nonzero crystal anisotropy field, chaotic dynamics occurs at much lower magnitudes of the spin current and dc applied field. ©2009 American Institute of Physics
History: Received 20 February 2009; accepted 15 October 2009; published 3 November 2009
Permalink: http://link.aip.org/link/?CHAOEH/19/043111/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.70.Ak
    Magnetic properties of monolayers and thin films
  • 75.47.De
    Giant magnetoresistance
  • 85.75.-d
    Magnetoelectronics; spintronics
  • 75.30.Gw
    Magnetic anisotropy
  • 75.50.Tt
    Fine-particle magnetic systems; nanocrystalline materials
  • 72.25.-b
    Spin polarized transport
  • YEAR: 2009

PUBLICATION DATA

ISSN:
1054-1500 (print)   1089-7682 (online)
Publisher:
AIP is a member of CrossRef AIP

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