The "Single-conductor and ratch" bubble propagating circuit

Abstract

A single-phase vertical-field bubble propagating circuit is described. High-speed bubble propagation along a single-conductor line is realized to give an oscillating bias field driven by a monopolar current pulse in the conductor to the magnetostatically trapped bubbles in ratch patterns. The relation between the pulse amplitude and the propagation distance of the bubble is analyzed. A two-way propagating circuit useful for the transfer gate is realized, based on the transverse motion of bubbles. Loop circuits, transfer gates, and a generator circuit as well as various shift registers have been designed and tested. The propagation speed of 1 MHz could be obtained under the applied current of 800 mA, using YFeO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> crystal platelet of thickness 80μm, the conductor of width 30μm, and the ratch patterns of period 110μm. A structure of a major/minor loop organized memory circuit with a function of dynamic reallocation of data is proposed.