Abstract
We studied current-induced magnetic switching and excitations in structures comprising a free layer with in-plane magnetization traversed by a current with perpendicular-to-plane spin polarization. We derived analytical solutions from the Landau-Lifshitz-Gilbert equation including the spin-torque term, and compared them to numerical simulations within the single domain assumption. Taking into account the criterion of thermal stability, the magnetization switching in nanostructures of typical size below 100 nm comprising a perpendicular polarizer is found to require larger current density but to be much faster than with a longitudinal polarizer. Furthermore, a steady precession of magnetization can be generated in this geometry; those frequencies can be tuned from about 1 to 20 GHz by only changing the current without applying any external field. This opens a promising application as microwave sources.
| Original language | English |
|---|---|
| Article number | 022505 |
| Pages (from-to) | 022505-1-022505-3 |
| Journal | Applied Physics Letters |
| Volume | 86 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2005 Jan 10 |
Bibliographical note
Funding Information:This work was supported by the RTB project of CEA/LETI. The authors acknowledge Professor A. Vedyaev for fruitful discussions.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)