Single Crystal Cylindrical Magnetic Domain Materials for Memory Applications

摘要

The first part of the report describes a two-dimensional mathematical model currently being used to describe field access bubble domain propagation. The model is based upon a continuous in-plane magnetization distribution in the permalloy which is determined by minimizing the system energy-assumed to consist of Zeeman and Magnetostatic energy contributions. The numerical techniques required to solve the resulting coupled Fredholm integral equations are described as well as the complete computer program used to analyze propagation in realistic permalloy patterns. Results are presented and discussed for bubble propagation along a 90 degree Chevron, a T-bar and a Y-bar. The second part of this report describes the design and construction of a high-frequency multiple-bar-Chevron shift register. Each of the individual components - generator, track, detector, annihilator - are described along with the experiments used to design them. (Modified author abstract)