System with magnetically stable states and method for asserting magnetically stable state
US9224941B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2010 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Mar 31, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10B61/22
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosed subject matter relates to a non-volatile memory bit cell (500 or 600) for solid-state data storage, including, e.g., an elongated magnetic element (102) or “dot”. For appropriate geometry and dimensions of the dot, a two-fold, energetically-degenerate micromagnetic configuration (100 or 200) can be stabilized. Such a stable configuration can consist of two magnetic vortices (1081, 1082) and a flower state region (110). Due to energy minimization, the flower state region can be off-center (relative to a minor axis (106)) and along the major axis (104) of the dot. An electrical current (302) flowing perpendicular to the plane at, or in proximity to, the dot center can, according to current polarity, switch the configuration or state of the dot between the two specular magnetically stable configurations (e.g., a write operation). Reading of the cell state can be accomplished by using the magnetoresistive effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.