To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Mode-hopping mechanism ge… - University of Gothenburg, Sweden Till startsida
Sitemap
To content Read more about how we use cookies on gu.se

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
Links dx.doi.org/10.1063/1.4896634
Keywords MODULATION, Physics, Applied
Subject categories Physical Sciences

Abstract

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.

Page Manager: Webmaster|Last update: 9/11/2012
Share:

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?