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Activation Volumes of Wall-Motion and Nucleation Processes in Co/Pd Multilayers |
Journal of Magnetics, Volume 5, Number 2, 30 Jun 2000, Pages 35-39 |
Sug-Bong Choe(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology), Sung-Chul Shin(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science Technology) |
Abstract |
The correlation between the activation volumes of wall-motion and nucleation processes in Co/Pd multilayers has been investigated. Each activation volume was estimated from the field dependence of the wall-motion speed and the nucleation rate, respectively, based on time-resolved domain patterns grabbed by a MOKE microscope system. Both the activation volumes are changed in the same manner around 0.2~1.1×10-17 cm3 with changes in the multilayered structure. Interestingly, the correlation between the activation volumes is sensitive to the multilayered structure; the wall-motion activation volume is smaller than the nucleation activation volume for a sample having a smaller number of repeats and a thinner Co-layer thickness, and vice versa. The correlation is closely related with the contrasting reversal modes; the process having the smaller activation volume dominates. |
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