Gradientless propulsion of magnetic bubble domains using modulated in-plane fields
US4118793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Jan 12, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0825
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Magnetic bubble domains are propagated in a magnetic medium in a desired direction using in-plane magnetic fields which are time varying but which have no spatial gradients. In applications such as information storage, the need for conventional propagation structures, such as offset conductor loops, patterned magnetic elements, and patterned ion implantation regions is reduced. Bubble domains having unwinding pairs of Bloch lines in their wall magnetization can be moved by applying appropriate in-plane magnetic fields, without the need for spatial gradients or variations in the magnetic field normal to the plane of the magnetic medium. The continuous movement of these bubble domains occurs by a cyclic process where the Bloch lines switch between two configurations, in an asymmetric way in response to the time varying in-plane field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.