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Spin accumulation, spin currents, and torque, in the problem of motion of a sharp domain wall in magnetic nanowires
Author(s) -
Vieira V. R.,
Dugaev V. K.,
Sacramento P. D.,
Barnaś J.,
Araújo M. A. N.,
Berakdar J.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200562413
Subject(s) - condensed matter physics , domain wall (magnetism) , physics , nanowire , spin polarization , torque , spin transfer torque , spin (aerodynamics) , current density , electron , magnetic field , quantum mechanics , magnetization , thermodynamics
We consider the motion of a sharp domain wall in magnetic nanowires with electric current. The width of the domain wall is much smaller than the electron wavelength, which is typical for magnetic semiconductors. We calculate the distributions of the spin density and the spin current related to different modes of the scattering states. The accumulated transverse components of the spin density and the spin current oscillate in the vicinity of the wall and they essentially affect its dynamics, whereas the longitudinal part of the spin current is responsible for another component of the spin torque creating a force for the current‐induced motion of the domain wall along the nanowire. We also analyze the dynamics of the sharp domain wall using the standard Landau–Lifshits–Gilbert formalism and the two‐component spin torque calculated for this model. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)