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| Authors |
R. Sharma Philipp Dürrenfeld Ezio Iacocca O. G. Heinonen Johan Åkerman Pranaba Muduli Kishor |
|---|---|
| Published in | Applied Physics Letters |
| Volume | 105 |
| Issue | 13 |
| ISSN | 0003-6951 |
| Publication year | 2014 |
| Published at |
Department of Physics (GU) |
| Language | en |
| Links |
dx.doi.org/10.1063/1.4896634 |
| Keywords | MODULATION, Physics, Applied |
| Subject categories | Physical Sciences |
The frequency noise spectrum of a magnetic tunnel junction based spin torque oscillator is examined where multiple modes and mode-hopping events are observed. The frequency noise spectrum is found to consist of both white noise and 1/f frequency noise. We find a systematic and similar dependence of both white noise and 1/f frequency noise on bias current and the relative angle between the reference and free layers, which changes the effective damping and hence the mode-hopping behavior in this system. The frequency at which the 1/f frequency noise changes to white noise increases as the free layer is aligned away from the anti-parallel orientation w.r.t the reference layer. These results indicate that the origin of 1/f frequency noise is related to mode-hopping, which produces both white noise as well as 1/f frequency noise similar to the case of ring lasers. (C) 2014 AIP Publishing LLC.
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