Switchable lossey/non-lossey permalloy thin films

Abstract

We report on the change in magnetic properties of rf sputtered Ni81Fe19 films of variable thickness with 0.3 x 0.3 mm arrays of 100 μm holes defined upon the film using photolithographic processing, and 50 )j.m, and 100 μm diameter holes of variable array density defined using laser ablation. The 10 Hz BH loops, 10 to 500 MHz complex permeability spectra, and domain patterns of patterned, single layer rf sputtered Ni81Fe19 thin films were measured. A switchable lossey/non-lossey regime could be obtained by either adjusting the thickness of the film or spacing of the hole array. © 1997 IEEE.