Magnetic memory cell with shape anisotropy
US6765823B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2003 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jan 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10B61/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A magneto-resistive memory comprising magneto-resistive memory cells is disclosed, comprising a pinned magnetic layer and a free magnetic layer. The two magnetic layers are formed having widened regions at the ends of the layers. As such, the shape made out by the magneto-resistive memory, from a top-view perspective, is wide at the ends and narrower at the mid-, forming an I shape in one preferred embodiment. The end portions of the free magnetic layer are allowed to magnetically couple to the end portions of the pinned magnetic layer such that magnetic coupling is shifted to these widened regions and coupling in the mid-portion between the widened regions is minimized. Thus, the influence of the pinned magnetic layer on the magnetization orientation of the mid-portion of the free magnetic layer is substantially eliminated, allowing for increased predictability in switching behavior and increased write selectivity of memory cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.