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| Time-resolved Observation of Field-dependent Magnetization Reversal Behavior in Co/Pd Multilayer Film |
| Journal of Magnetics, Volume 8, Number 3, 30 Sep 2003, Pages 108-112 |
Kwang-Su Ryu*  (Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology), Kyeong-Dong Lee(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology), Sug-Bong Choe(Advanced Light Source, Lawrence Berkeley National Laboratory), Sung-Chul Shin(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology) |
| Abstract |
| We report the experimental finding that there exists a transition of magnetization reversal process with varying the applied field in Co/Pd multilayer. We have measured the wall-motion speed V and the nucleation rate R during magnetization reversal via time-resolved direct domain observation, where the magnetization reversal process of Co/Pd multilayer is found to take a transition from thermal activation process to viscous process at the critical field of about 1.87 Hc (coercivity). In the thermal activation regime, we find that the field dependences of two activation volumes for the wall-motion process and the nucleation process are different with each other, which reveals that the wall-motion and nucleation experience completely different interactions. In the viscous regime, we find that the wall-mobility is much smaller than a typical value for the sandwiched Co films, which implies that the Co/Pd interfaces in multilayer substantially contribute to the dynamic dissipation. |
| Keywords: magnetization reversal behavior; thermal activation; viscous; multilayer |
| DOI: |
| Full Text: PDF |
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