JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 卷:321 |
Magneto-optical and micromagnetic simulation study of the current-driven domain wall motion in ferromagnetic (Ga,Mn) As | |
Article | |
Wang, K. Y.1  Irvine, A. C.2  Campion, R. P.3  Foxon, C. T.3  Wunderlich, J.1  Williams, D. A.1  Gallagher, B. L.3  | |
[1] Hitachi Cambridge Lab, Cambridge CB3 0HE, England | |
[2] Univ Cambridge, Cavendish Lab, Microelect Res Ctr, Cambridge CB3 0HE, England | |
[3] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England | |
关键词: Spin-torque; Magneto-optical; Micromagnetic; | |
DOI : 10.1016/j.jmmm.2008.03.022 | |
来源: Elsevier | |
【 摘 要 】
We have studied current-driven domain wall motion in modified Ga0.95Mn0.05 As Hall bar structures with perpendicular anisotropy by using spatially resolved polar magneto-optical Kerr effect microscopy and micromagnetic simulation. Regardless of the initial magnetic configuration, the domain wall propagates in the opposite direction to the current with critical current of 1-2 x 10(5) A/cm(2). Considering the spin-transfer torque term as well as various effective magnetic field terms, the micromagnetic simulation results are consistent with the experimental results. Our simulated and experimental results suggest that the spin-torque rather than Oersted field is the reason for current-driven domain wall motion in this material. (C) 2008 Elsevier B.V. All rights reserved.
【 授权许可】
Free
【 预 览 】
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10_1016_j_jmmm_2008_03_022.pdf | 345KB | download |