Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator
Abstract
The frequency noise spectrum of a magnetic tunnel junction (MTJ) based spin torque oscillator (STO) 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. Here, 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. Lastly, 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.
- Authors:
-
- Indian Inst. of Technology (IIT), New Delhi (India)
- Univ. of Gothenburg (Sweden). Dept. of Physics
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Univ. of Gothenburg (Sweden). Dept. of Physics; KTH Royal Inst. of Technology, Kista (Sweden). School of Information and Communication Technology (ICT)
- Indian Inst. of Technology (IIT), New Delhi (India); Univ. of Gothenburg (Sweden). Dept. of Physics
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- Swedish Foundation for Strategic Research (SSF); Swedish Research Council (VR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1357043
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 105; Journal Issue: 13; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; 1/f noise; Machinery noise; Linewidths; Thermal noise; Spectrum analyzers
Citation Formats
Sharma, Raghav, Dürrenfeld, P., Iacocca, E., Heinonen, O. G., Åkerman, J., and Muduli, P. K. Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator. United States: N. p., 2014.
Web. doi:10.1063/1.4896634.
Sharma, Raghav, Dürrenfeld, P., Iacocca, E., Heinonen, O. G., Åkerman, J., & Muduli, P. K. Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator. United States. https://doi.org/10.1063/1.4896634
Sharma, Raghav, Dürrenfeld, P., Iacocca, E., Heinonen, O. G., Åkerman, J., and Muduli, P. K. Mon .
"Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator". United States. https://doi.org/10.1063/1.4896634. https://www.osti.gov/servlets/purl/1357043.
@article{osti_1357043,
title = {Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator},
author = {Sharma, Raghav and Dürrenfeld, P. and Iacocca, E. and Heinonen, O. G. and Åkerman, J. and Muduli, P. K.},
abstractNote = {The frequency noise spectrum of a magnetic tunnel junction (MTJ) based spin torque oscillator (STO) 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. Here, 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. Lastly, 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.},
doi = {10.1063/1.4896634},
journal = {Applied Physics Letters},
number = 13,
volume = 105,
place = {United States},
year = {Mon Sep 29 00:00:00 EDT 2014},
month = {Mon Sep 29 00:00:00 EDT 2014}
}
Web of Science
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