Wavering conductor loops for magnetic domain memories
US4064496A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Dec 20, 1977 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/0841
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed are magnetic domain (bubble) memory arrays and correlator type memory arrays in uniaxially anisotropic crystals which utilize wavering loop conductor patterns at each bit location defining three contiguous magnetic domain retaining regions. On current reversal a bubble in the center loop of a wavering loop pattern will be equally attracted to either of the outside loops. Decision control is provided by a second array of two conductor lines interposed between the respective domain retaining regions. These control conductors establish an aiding or inhibiting magnetic field when current flows through them. In an alternate design a correlator function is obtained by using bubbles retained in previously disclosed bistable loops as memory elements and interrogating them by means of auxiliary bubbles driven by adjacent wavering loops. In operation, the bistable conductor loops defining the two memory states are placed on either side of a crystalline platelet to jointly define two domain retaining memory regions. The presence of a bubble at either memory site is sensed by its repulsion of an adjacent interrogating bubble controlled by a wavering loop pattern. Magnetoresistive sen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.