Communications: electrical – Digital comparator systems
Patent
1974-07-01
1976-09-21
Moffitt, James W.
Communications: electrical
Digital comparator systems
340174EB, 340174ZB, G11C 1114
Patent
active
039822346
ABSTRACT:
Stationary patterns of magnetic domains in a film layer of magnetically hard material define local field gradients for movement control of single-wall domains located in a contiguous sheet of magnetic "bubble" material. Suitable patterns of uniformly magnetized regions are established in the hard-magnetic film to provide the control pattern. A second garnet film of suitable composition, for instance, may be grown epitaxially on the bubble medium to provide the hard magnetic control film. Bubble domain confinement and propagation patterns are established in the hard-magnetic film by conventional recording methods or the desired pattern can be generated by projection or scanning the pattern with a light beam or an electron beam, or by thermomagnetic transfer from a master pattern.
REFERENCES:
patent: 3778788 (1973-12-01), Bobeck et al.
patent: 3836898 (1974-09-01), Bobeck et al.
patent: 3887905 (1975-06-01), Bobeck et al.
patent: 3944842 (1976-03-01), Dorleijn et al.
Applied Physics Letters -- vol. 23; No. 8; Oct. 15, 1973 pp. 485-487.
American Institute of Physics -- AIP Conference Proceedings No. 5, part 1; Nov. 16-19, 1971 pp. 130-134.
International Business Machines - Corporation
Kieninger Joseph E.
Moffitt James W.
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