We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
CURRENT-INDUCED SPIN TORQUE ON A DOMAIN WALL IN A MAGNETIC NANOWIRE.
- Authors
DUGAEV, V. K.; VIEIRA, V. R.; SACRAMENTO, P. D.; BARNAŚ, J.; ARAÚJO, M. A. N.; BERAKDAR, J.
- Abstract
We develop a theory applicable in the regime, where the wavelength of spin up and down electrons, λ↑,↓, is smaller than the DW width L (smooth DW). This regime is appropriate for strongly doped magnetic semiconductors and metallic ferromagnets. We develop an approach related to a weak (adiabatic) perturbation arising after a local transformation to the uniform magnetization. In the limit of L ≫ λ↑,↓ we find an exponentially small reflection and spin-flip transition amplitudes. The theory is useful in the regime, where the DW width is not so large, and the perturbation corrections to the wave functions are quite essential. We calculate the current-induced spin density and the spin torque acting locally on the magnetic moments within the DW. The spatially-distributed torque acts as a force pushing the DW in one direction as a response to the external current, and also as an internal force, which can distort the static ordering of magnetic moments in the DW.
- Subjects
ROTATIONAL motion (Rigid dynamics); TORQUE; ASTRONOMICAL perturbation; PARTICLES (Nuclear physics); CATHODE rays; ELECTRIC conductivity; SOLID state electronics
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2007, Vol 21, Issue 8/9, p1659
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979207043385