Magnetization reversal process and the critical diameter for single and multidomain of multilayer dot were investigated by detecting anomalous Hall effect of a single dot with diameter ranging from . The perpendicular anisotropy constant was varied from by changing the Co layer thickness. The dominant magnetization process for the dots with was domain wall displacement, while nucleation of a reversed embryo governed the reversals in the dots smaller than . The for stable single domain increases with from to larger than . This behavior is mainly due to the increase of domain wall energy owing to the increase of , and the coincides very well with the domain size of continuous films.
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