Open AccessMicromagnetic simulations of current-induced magnetization switching in Co∕Cu∕Co nanopillars
Author(s) -
Z. H. Xiao,
Xingqiao Ma,
Ping Wu,
J. X. Zhang,
LongQing Chen,
SanQiang Shi
Publication year - 2007
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.2800999
Subject(s) - nanopillar , magnetization , condensed matter physics , demagnetizing field , micromagnetics , current density , magnetic anisotropy , materials science , spin transfer torque , current (fluid) , magnetic field , physics , nanotechnology , quantum mechanics , nanostructure , thermodynamics
We studied the current-induced magnetic switching in Co/Cu/Co nanopillars with an in-plane magnetization traversed by a perpendicular-to-plane spin-polarized current. The Landau-Lifshitz-Gilbert equation incorporating the spin transfer torque (STT) effect was employed. Magnetization switching was found to take place when the current density exceeds a threshold. It is accompanied by drastic oscillations near the magnetic reversal point. The switching time depends on the applied current density. The magnetization can also be switched by a sufficiently long square pulsed current. The roles of anisotropy, exchange, and demagnetization energies in the magnetization switching process of nanopillars are discussed. It is shown that the switching is mainly determined by the competition between STT and the Gilbert damping torque.Department of Mechanical EngineeringAuthor name used in this publication: S. Q. Sh
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