Current-induced domain wall motion in magnetic nanowires with spatial variation |
| |
| Authors: | Jun’ichi Ieda Hiroki Sugishita Sadamichi Maekawa |
| |
| Affiliation: | 1. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;2. CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan;1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1, N1-7, O-okayama, Meguro-ku, Tokyo 152-8550, Japan;2. Department of Mechanical Engineering, Muroran Institute of Technology, 27-1, Mizumoto-cho, Muroran, Hokkaido 050-8585, Japan;1. National Research Nuclear University MEPhI, Kashirskoe sh., 31, Moscow 115409, Russia;2. Moscow State University of Technology STANKIN, Vadkovskii per., 3a, Moscow 127005, Russia;3. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky Prospect 49, Moscow 119991, Russia;4. Lomonosov Moscow State University Scobeltsyn Institute of Nuclear Physics, 1(2) Leninskie Gory, GSP-1, Moscow 119991, Russia;1. Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka, 811-0295, Japan;2. Department of Electrical Engineering, Faculty of Science and Engineering, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka, 813-8503, Japan;3. Physonit Inc., 6-10 Minami-Horikawa, Kaita Aki, Hiroshima, 736-0044, Japan;1. Laboratory of Magnetism and Physics of High Energy (LMPHE-URAC 12), Mohammed V University, Faculty of Sciences, P. O. Box 1014, Rabat, Morocco;2. Institute of Nano-materials and Nanotechnology, MAScIR, Rabat, Morocco;3. Hassan II Academy of Science and Technology, Rabat, Morocco |
| |
| Abstract: | We model current-induced domain wall motion in magnetic nanowires with the variable width. Employing the collective coordinate method we trace the wall dynamics. The effect of the width modulation is implemented by spatial dependence of an effective magnetic field. The wall destination in the potential energy landscape due to the magnetic anisotropy and the spatial nonuniformity is obtained as a function of the current density. For a nanowire of a periodically modulated width, we identify three (pinned, nonlinear, and linear) current density regimes for current-induced wall motion. The threshold current densities depend on the pulse duration as well as the magnitude of wire modulation. In the nonlinear regime, application of ns order current pulses results in wall displacement which opposes or exceeds the prediction of the spin transfer mechanism. The finding explains stochastic nature of the domain wall displacement observed in recent experiments. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
