Method and apparatus for controlled generation of wall topology

Communications: electrical – Digital comparator systems

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G11C 1114

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040017940

ABSTRACT:
Magnetic domains with defined wall topologies are controllably generated from a domain having known characteristics. A "mother" bubble domain of a known wall state is generated by nucleation. The mother domain is stretched and split in the presence of a magnetic field directed across the separation area. A pair of Bloch lines is generated in every splitting process. The assignment of the lines to either one of the two resulting domains depending upon the wall state of its mother domain and the direction of the directed magnetic field. Instead of the directed magnetic field, velocity inducing forces can be applied to the elongated domain. The effect desired is to incline the wall magnetization in the elongated section of the domain. Controlled resplitting of domains having Bloch lines increases the number of Bloch lines in one domain to generate any predesignated wall state. The multiplicity of states which can be controllably generated anticipates their utilization beyond binary bit coding.

REFERENCES:
patent: 3706081 (1972-12-01), Bobeck et al.
patent: 3890605 (1975-06-01), Sionczewski
IBM Technical Disclosure Bulletin, vol. 17, No. 5, Oct. 1974 p. 1485.

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