Magnetic domain memory
US3999172A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1974 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Nov 29, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0875
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A magnetic domain memory having a layer of magnetic material in which magnetic domains can be moved under the influence of an external magnetic force. The memory includes a plurality of closed loops for the storage and guided movement of magnetic domains. Each magnetic domain in each memory storage loop has a virtual position with respect to all the other magnetic domains in that loop. A magnetic domain generator creates the magnetic domains for movement along an input path to the memory storage loops. A separate output path allows movement of the magnetic domains from each memory storage loop to a detection point where a detector senses the presence of magnetic domains. A first one-way gate at a first point on each loop transfers magnetic domains from the input path into that loop. A second one-way gate at a second point on each loop transfers magnetic domains from that loop to the output path. A transfer control, synchronized with the movement of the magnetic domains, selectively operates the first and second one-way gates. Thus, when a magnetic domain is transferred out of its virtual position in a memory storage loop at the second point on that loop by the second one-way gate, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.