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Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator

Journal article
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
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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