We have studied the magnetization switching behavior in single nanodots of an epitaxially grown Co/Pt multilayer with various dot diameters (d) ranging from 120 to 1600 nm. The switching behaviors in all the dots used in this study are considered to be of the nucleation type from the angular dependence of the switching field. However, detailed analysis of the thermally activated magnetization switching reveals that there is a critical diameter (dc) of 400nm above which the switching process changes. For d < dc, the switching behavior of the dot is well explained by the nucleation process based on the single-energy barrier model. On the other hand, the switching behavior for d ; dc obviously deviates from that for d < dc and can be plausibly explained by the multi-barrier model.
ASJC Scopus subject areas
- Physics and Astronomy(all)