Flexible ferrite keepers and their applications in thin film memories

Results of an investigation of flexible keepers are reported. The parameters studied include the composition, preparation, and particle size of the ferrite and the thickness and binder content of the sheet. The optimization of these parameters improved the performance of the keeper by 10 percent. The use of the improved keeper in thin film memory arrays results in reducing the increase of bit drive current due to worst case effects by a substantial amount.