A consideration of the bit-density limitations in plated-wire memory

In order to increase bit packing densities in plated-wire memories, their film thickness should be increased instead of being decreased. By laminating them with nonmagmetic intermediate layers, the total thickness of magnetic layers can be increased still preserving their characteristics. A contract flux keeper is useful for compensating for the increase of demagnetizing effects induced by the reduction of bit size and also by the increase of film thickness, but in order to reduce the bit size to below 0.4 mm its effective permeability has to be increased. The magnetization spread can be estimated by using adjacent disturb thresholds.