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

被引：44
|
作者：
Nguyen, Anh Kiet [1 ]
Skadsem, Hans Joakim [1 ]
Brataas, Arne [1 ]
机构：
[1] Norwegian Univ Sci & Technol, Dept Phys, N-7491 Trondheim, Norway
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 14期
关键词：
D O I：
10.1103/PhysRevLett.98.146602
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 nonadiabatic spin-transfer torque and consequently the current-driven domain wall mobility by 3 to 4 orders of magnitude. Trends and magnitude of the calculated domain wall current mobilities agree with experimental findings.
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页数：4
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