Eddy-current-free switching of permalloy thin films

Results are presented from an experimental investigation of large-angle flux reversal of magnetic films. The reported measurements were made with an unconventional instrument whose design features are briefly outlined. Switching characteristics for a selected film are shown; coefficients are compared with results of others in region II at 2° transverse bias. The 6 Oe .ns is a magnitude faster than others although the switching field rise time is an order of magnitude slower. On a 2 dimensional field plot, loci which define thresholds of incoherent rotation are found to have two prominent features : a disperse switching astroid for , and an extension described by for . The width of region II, the lower threshold for region II, and the independently-measured dispersion field are all approximately 0.1 Oe for the subject film. Thus .