Physics – Condensed Matter – Materials Science
Scientific paper
2008-11-25
Physics
Condensed Matter
Materials Science
19 pages, 1 figure
Scientific paper
10.1088/0953-8984/21/14/146002
An extended Landau-Lifshitz-Gilbert (LLG) equation is introduced to describe the dynamics of inhomogeneous magnetization in a current-carrying wire. The coefficients of all the terms in this equation are calculated quantum-mechanically for a simple model which includes impurity scattering. This is done by comparing the energies and lifetimes of a spin wave calculated from the LLG equation and from the explicit model. Two terms are of particular importance since they describe non-adiabatic spin-transfer torque and damping processes which do not rely on spin-orbit coupling. It is shown that these terms may have a significant influence on the velocity of a current-driven domain wall and they become dominant in the case of a narrow wall.
Edwards D. M.
Wessely Ola
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