Hard-magnetic film overlay apparatus and method for magnetic mobile domain control
US3982234A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1974 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Jul 1, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0833
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.