Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
권호 표지

Activation Volumes of Wall-Motion and Nucleation Processes in Co/Pd Multilayers

  • Choe, Sug-Bong (Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology) ;
  • Shin, Sung-Chul (Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science Technology)
  • Published : 2000.06.01
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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 $0.2\sim1.1\times10^{-17}cm^3$ 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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