Control of the permeability loss-peak frequency of Ni81Fe19 thin films through laser ablation of triangular and square cluster geometries

Craig A. Grimes, Janet K. Lumpp
2000 Journal of Applied Physics  
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 spectra
more » ... ility spectra correlates with a dramatic increase in domain wall density.
doi:10.1063/1.373312 fatcat:3xkdo5cl6za3bktyxohynoyfhq