Method for building a magnetic keeper or flux concentrator used for writing magnetic bits on a MRAM device
US6914805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2002 |
| Grant date | Jul 5, 2005 |
| Priority date | — |
| Expiry date | Aug 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/16
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An MRAM device comprising an array of MRAM elements, with each element having an MRAM bit influenced by a magnetic field from a current flowing through a conductor, also includes a magnetic keeper formed adjacent the conductor to advantageously alter the magnetic field. The magnetic keeper alters the magnetic field by concentrating the field within the keeper thereby reducing the extent in which fringe field exists, thus allowing the MRAM elements to be formed closer to increase the areal density of the MRAM device. Increase in magnetic field flux due to the magnetic keeper allows operation of the MRAM device with lowered power. Soft magnetic materials such as nickel iron, nickel iron cobalt, or cobalt iron may be used to form the magnetic keeper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.