Field access of bubble domain lattice

Abstract

Propagation of a lattice of magnetic bubble domains by field access techniques is achieved by using a periodic array of magnetic chevron elements. In response to the reorientation of a magnetic drive field in the plane of the chevron elements, magnetic poles are established to directly drive the lattice bubble domains. Those lattice domains not directly driven by magnetic poles are driven by repulsive forces within the lattice, such as those due to bubble-bubble interactions. The chevron arrays are designed to conform to the bubble lattice framework and patterns are established in which multiple bubble domains are associated with each chevron. The chevron elements can be symmetrical elements or skewed elements, and patterns are provided which can be used to drive multiple rows or columns of bubbles per chevron row or column. Generally, bubble domains alternate between being directly driven by magnetic poles along the chevrons and being indirectly driven by repulsive forces in the lattice. The exception to this is the array of extremely skewed and densely packed chevron elements where the directly driven bubble domains remain directly driven during all cycles of propagation.