The picosecond magnetization dynamics of arrays of square Ni₈₈Fe₁₂∕Co₈₀Fe₂₀ bilayer nanoelements were studied by optical pump-probe measurements. Experimentally observed modes were found to fall upon two branches, with a crossover from the high- to low-frequency regime as the element size was reduced to less than 2200.3em0exnm. Micromagnetic simulations revealed that the branches are associated with center and edge modes. The edge mode is found to dominate as the element size is reduced so that the magnetic response to a pulsed field becomes less spatially uniform.
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Kruglyak et al. (2005) studied this question.
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