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Magneto-optical and micromagnetic simulation study of the current-driven domain wall motion in ferromagnetic (Ga,Mn)As |
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| Authors: | K.Y. Wang A.C. Irvine C.T. Foxon D.A. Williams |
| Affiliation: | a Hitachi Cambridge Laboratory, Madingley Road, Cambridge CB3 0HE, UK b Cavendish Laboratory, Microelectronics Research Centre, University of Cambridge, Cambridge CB3 0HE, UK c School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK |
| Abstract: | We have studied current-driven domain wall motion in modified Ga0.95Mn0.05As 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 1-2×105 A/cm2. 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. |
| Keywords: | Spin-torque Magneto-optical Micromagnetic |
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