| Issue |
EPL
Volume 87, Number 5, September 2009
|
|
|---|---|---|
| Article Number | 57001 | |
| Number of page(s) | 4 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/87/57001 | |
| Published online | 16 September 2009 | |
Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators
1
IMEC - Kapeldreef 75, B-3001 Leuven, Belgium, EU
2
Institut d'Electronique Fondamentale, CNRS, UMR 8622 - 91405 Orsay, France, EU
3
Université Paris-Sud - 91405 Orsay, France, EU
4
Department of Engineering Materials, University of Sheffield - Sheffield S1 4DU, UK, EU
Corresponding author: joo-von.kim@u-psud.fr
Received:
4
May
2009
Accepted:
17
August
2009
We present an experimental study of the power spectrum of current-driven magnetization oscillations in MgO tunnel junctions under low bias. We find the existence of narrow spectral lines, down to 8 MHz in width at a frequency of 10.7 GHz, for small applied fields with clear evidence of an auto-oscillation threshold. Micromagnetics simulations indicate that the excited mode corresponds to an edge mode of the synthetic antiferromagnet.
PACS: 75.75.+a – Magnetic properties of nanostructures / 72.25.Pn – Current-driven spin pumping / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
© EPLA, 2009
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