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

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:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Indian Inst. of Technology (IIT), New Delhi (India)
  2. Univ. of Gothenburg (Sweden). Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Univ. of Gothenburg (Sweden). Dept. of Physics; KTH Royal Inst. of Technology, Kista (Sweden). School of Information and Communication Technology (ICT)
  5. Indian Inst. of Technology (IIT), New Delhi (India); Univ. of Gothenburg (Sweden). Dept. of Physics
Publication Date:
Grant/Contract Number:
AC02-06CH11357
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)
Research Org:
Argonne National Lab. (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) (SC-22)
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
OSTI Identifier:
1357043

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., 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. doi:10.1063/1.4896634.
Sharma, Raghav, Dürrenfeld, P., Iacocca, E., Heinonen, O. G., Åkerman, J., and Muduli, P. K.. 2014. "Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator". United States. doi: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 = {2014},
month = {9}
}