High-density magnetic bubble memory device
US4617644A · kind A · utility
0Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1984 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Mar 19, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0808
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A high-density magnetic bubble memory device using magnetic bubbles having a diameter not larger than 2 .mu.m comprises a magnetic layer capable of sustaining the bubbles therein, and a propagation pattern formed in or on a surface of the magnetic layer. In the device, a relation H/d.ltoreq.0.8 is satisfied wherein H is the thickness of the magnetic layer and d the diameter of the bubble. When the propagation pattern is made of a permalloy, h/d (h: bubble height in that case) is not larger than 0.8. When the propagation pattern is formed through ion implantation, h'/d (h': bubble height in that case) is not larger than 0.6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.