Switching of perpendicularly magnetized nanomagnets with spin-orbit torques in the absence of external magnetic fields
US11626229B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2021 |
| Grant date | Apr 11, 2023 |
| Priority date | — |
| Expiry date | Apr 15, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S148/109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of controlling a trajectory of a perpendicular magnetization switching of a ferromagnetic layer using spin-orbit torques in the absence of any external magnetic field includes: injecting a charge current Je through a heavy-metal thin film disposed adjacent to a ferromagnetic layer to produce spin torques which drive a magnetization M out of an equilibrium state towards an in-plane of a nanomagnet; turning the charge current Je off after te seconds, where an effective field experienced by the magnetization of the ferromagnetic layer Heff is significantly dominated by and in-plane anisotropy Hkx, and where M passes a hard axis by precessing around the Heff; and passing the hard axis, where Heff is dominated by a perpendicular-to-the-plane anisotropy Hkz, and where M is pulled towards the new equilibrium state by precessing and damping around Heff, completing a magnetization switching.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.