Magnetic device to reduce reversal current in current-driven magnetic reversal and magnetic memory using same
US7486486B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2004 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Jul 31, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/1276
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic device includes a first ferromagnetic layer in which magnetic layers and one or more nonmagnetic layers are alternately stacked, a second ferromagnetic layer having magnetization substantially fixed to a second direction, a third ferromagnetic layer provided between the first and second ferromagnetic layers and having a variable direction of magnetization, and a couple of electrodes configured to provide write current between the first and second ferromagnetic layers so that the direction of magnetization of the third ferromagnetic layer is determined depending on a direction of the current. At least one layer of the magnetic layers has magnetization substantially fixed to a first direction. Two or more layers of the magnetic layers are ferromagnetically coupled via the nonmagnetic layers. The ferromagnetic coupling has a strength such that a parallel magnetic alignment of the magnetic layers is maintained when the write current is passed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.