Giant current-driven domain wall mobility in (Ga,Mn)As

Details Giant current-driven domain wall mobility in (Ga,Mn)As Giant current-driven domain wall mobility in (Ga,Mn)As

2006-06-19

arxiv.org/abs/cond-mat/0606498v3

Phys. Rev. Lett. 98, 146602 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version accepted by Physical Review Letters

Scientific paper

We study theoretically hole current-driven domain wall dynamics in (Ga,Mn)As. We show that the spin-orbit coupling causes significant hole reflection at the domain wall, even in the adiabatic limit when the wall is much thicker than the Fermi wavelength, resulting in spin accumulation and mistracking between current-carrying spins and the domain wall magnetization. This increases the out-of-plane non-adiabatic spin transfer torque and consequently the current-driven domain wall mobility by three to four orders of magnitude. Trends and magnitude of the calculated domain wall current mobilities agree with experimental findings.

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