Current-access magnetic bubble circuits

Current-access magnetic bubble devices which can operate at 10 to the 7th bits/sq cm and frequencies greater than 1 MHz use bubble-driving fields based on 2-patterned conducting sheets instead of orthogonal field coils. The design criteria, magnetic field equations, and design curves are presented for the generation, propagation, and transfer on 8-micron periods which required 1.5 mA/micron per sheet and dissipated 14 microW/bit. The (LaLuSm)3(FeGa)5(O)12 magnetic material was best suited for this application; it is expected that current access devices will produce higher data rates, lower power consumption per bit, and greater storage densities than the conventional field-access devices.