Current-induced dynamics of spiral magnet
Abstract
We study the dynamics of the spiral magnet under the charge current by solving the Landau-Lifshitz-Gilbert equation numerically. In the steady state, the current j induces (i) the parallel shift of the spiral pattern with velocity v=(β/α)j (α, β: the Gilbert damping coefficients), (ii) the uniform magnetization M parallel or anti-parallel to the current depending on the chirality of the spiral and the ratio β / α , and (iii) the change in the wavenumber k of the spiral. These are analyzed by the continuum effective theory using the scaling argument, and the various nonequilibrium phenomena such as the chaotic behavior and current-induced annealing are also discussed.
0