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Laser ablation arrays of triangular and square shaped clusters, comprised of 23 m diam circular holes, are defined upon 100 nm thick Ni 81 Fe 19 films used to control the rf permeability spectra. Cluster-to-cluster spacing is varied from 200 to 600 m. For each geometry it is found that the loss peak frequency and permeability magnitude shift lower, in a step-wise fashion, at a cluster-to-cluster spacing between 275 and 300 m. The nonlinear shift in the behavior of the permeability spectradoi:10.1063/1.373312 fatcat:3xkdo5cl6za3bktyxohynoyfhq