Volume 87, Number 5, September 2009
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 September 2009|
Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators
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: firstname.lastname@example.org
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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